Are you in the market for a perfect drill bit set to use in your home? Or are you seriously trying to replace your current drill bit set, which produces too much heat while in operation? If the goal is to acquire the best Cobalt drill bit set then it is essential to consider some key factors and features, which are explained in details in this buyer’s guide.

If you aim to choose the best power tool for your work space, what would you choose? For our money, a drill bit is a critical tool that ensures that we work efficiently and effectively on wide range of materials which includes, wood, plastic and metal. Nevertheless it is quite essential that we know that we are doing the right thing by making use of the correct drill bit. The fact is without these components, a drill is just not an efficient tool.

The fundamental component of the Cobalt drill bits is an alloy containing cobalt and steel.  Cobalt makes up about 5 to 8 % of the overall composition. This feature ensures that the drills are highly resistant to high temperatures particularly while drilling through cast Iron and stainless steel.

These drill bits are usually made M35 and M42 grade cobalt steel. This is why they have a high heat resistance capacity and durability. In this review, we compare the best cobalt drill bit sets, their features and what makes them exceptional in operation.

Welcome and let’s go over the review together.


The types of drill bits in this review are based on their tip style, shank style and length. Check them out below:

  1. Twist cobalt bits

This type of drill bits are often used for all kinds of surfaces and materials. The Twist cobalt drill is highly utilized in all kinds of operations. It is made of different sizes and can be used to perform multiple tasks. In addition, the strength of the cobalt twist drill increases with the shorter length of drill bits.

Consequently, the fear of breaking, twisting and spinning for the shorter twist bits is eliminated. Some bits also have coatings of gold oxide, bronze oxide which enhances their heat resistance capacity.

  1. Counter bore cobalt bits

The tiny middle hole which efficiently cuts through surfaces and the flat bottom in the Counter bore cobalt bit is a distinguishing feature.

They are often used to cover the apex of fasteners. The Counter bore drill bits are also used on wood and plastic surfaces. They do not have any coating and are made from high speed steels thus they are quite suitable for metal surfaces.

  1. Countersink drill bit

The Countersink drill bits are often used in drilling operations on wooden surfaces. They are used to make small pilot holes due to their small middle hole which also pierces the material thoroughly. Furthermore, this drill is able to sit/balance correctly without twisting from the surface due to its tapered fastener head.

  1. Cobalt step drill bit

They are typically used for operations on metals. The Cobalt step drill bit is capable of penetrating up to 0.25 inches inside the metal. With the step drill you can effortlessly drill several diameters of holes with just a single bit due to its stepped design. The step drill has a very efficient penetrative capability and thus can be very effective in working on wood material.

You can also combine this device with other functional devices like the car buffers, which will assist in polishing and buffering the car exteriors and anti-corrosion remedy, the grease guns that reduces corrosion in cars.

Several functional options are available for the cobalt drill bit set. It is vital to therefore keep in mind some factors such as length, durability, availability of sizes, tip point style, the component material of the bit, the case material and the resistance of the bit to high temperature.

Review and comparison of 5 top cobalt drill bit sets

  1. Irwin Tools 3018002 Cobalt M-35 Metal Index Drill Bit Set

This is the best option if you want to drill in tough metal, including heavy-duty abrasive alloy metal drilling on hard steel. They are typically composed of about 29 drill bit pieces in the super set. It is composed of industrial grade high-speed steel for increased durability. Cobalt alloys are heat and abrasive-resistant up to 8%. It has a 135-degree split-point tip which ensures that drilling can start immediately with less force and also “walking” on surfaces is eliminated. The metal index case readily assists you to choose the needed drill bit. The set has got 1/16- to 1/2-inch in 1/64-inch increments. A portable and durable case ensures that you can easily remove the cartridges and carry bits from case to the work site. The set’s dimensions are 12 x 7.5 x 4 inches, weight 4.4 pounds. It weighs about 2.2 pounds.

The casing is made of sports rubber molding with each nook branded for ease of identification of bits. Your drill bit case contains cartridges housing the drill bit which makes them easily removable and portable in a work place. The Irwin 29-Piece Cobalt M-35 Metal Index Drill Bit Set is durable and reasonably affordable and comes fully packed with everything tool you require to drill through hard, abrasive surface. For the money, this is one of the best cobalt drill bits sets available.

The Irwin Cobalt Drill Bits are heat resistant while in operation. They are consequently very suitable for full time workers or craftsmen who work on almost every type of material. The versatility of the Irwin Cobalt Drill Bits increases its durability. The entire 29 pieces in the set is made of high-speed steels, high-quality steel and cobalt (5%) construction. The solid feature of these cobalt drills make them highly abrasive resistant which increases their dependability and life span and also gives you the freedom to work on tough materials with ease.

Aside from its many benefits, the state of the arts construction of the drill enhances its cutting-edge shelf life. A unique design like the split-point style tips allows you to cut without using too much force. In addition, the reduced shank size of the larger bits ensures that you are able to use them in a bigger chuck. The manufacturer of this drill bit has also included a very useful selection of chart for convenient reference.

With the set’s automatic indexing, accessing and picking these drill bits are very easy. As far as convenience is considered, there are two additional features that also enhance this greatly. Firstly, the molded, rubber case ensures that the tools are well organized and safe. Secondly,   the cartridges are removable. This enhances the comfort and convenience in carrying them around. After examining several best cobalt drill bits, I discovered that all the other models available are as high maintenance as this one. The Irwin Cobalt Drill Bits needs to be frequently lubricated to prevent breakage.


  • It is used for highly rough metals
  • Cobalt enhances the cutting edge of the drills and also reduces the maintenance.
  • It is highly resistant to heat and produces no heat while in operation
  • The 135 degree split pointed apex reduces the force required in performing a task by making the operation very easy.
  • Its cutting edge is highly efficient and drill through surfaces with ease.
  • It is portable and easily carried on a work site.


  • A few bits may break after certain number of holes.
  • The bits need to be lubricated regularly to prevent breakage.
  1. Drill America DWD29J-CO-PC Qualtech 29 Piece Cobalt Steel Jobber Length Drill Bit Set

These are one of the best set of drills from Drill America which ensures that you get the full set of 20 bits that ranges from 1/16 to ½ inches, so that you can drill any hole in between. In comparison with other full sets drill on this list, the Drill America bits competes favourably due to the fact that they are composed of almost solid cobalt.

The Drill America bits is essentially a highly convenient and portable set of 29 jobber length drill bits with sizes in the range of 1/16″ to 1/2″ in 1/64″ increments. Cobalt steel ensures that the tools have a long life span. Each drill bit is made of a gold oxide finish which ensures that they are wear resistant.

In terms of performance, the Drill America bits are one of the best available. Breakage is very rare and they easily most metals.

While some hardened steels may provide some resistance during operation, they are able to deal with over 90% of all jobs.  They each designed with a 135-degree tip which typically ensures that they are quite capable of penetrating hard materials without a hole and produce little chips to reduce clogging.

They come in a pretty cool case. Even though it may be a little difficult to access the smaller bits in the middle, the case comes with a clip so that you can wear it on your belt for added convenience. In addition, it is also water and shatterproof which makes it a better choice than other cases available to you.


  • You have a 29 size options
  • A flexible 1/16 to ½ inches size increment
  • The bits are composed of Black and gold oxide finish
  • They are made to about 135-degree split point tips which enhances the ease of operation
  • The round shanks can easily fit into any drill chuck
  • The case cylinder is highly durable.
  • The case is highly portable as it comes with a clip you can easily wear.
  • The bits are rust resistant
  • The case is also water and shatterproof case


  • May not work exceptionally well on some hardened metals.
  • It is difficult to access and remove smaller bits from the case (may require tweezers)
  • The casing material quality is not very satisfying
  1. DEWALT DW1263 14-Piece Cobalt Pilot Point Drill Bit Set

The DW1263 is a highly efficient set of cobalt drill bits that provides the features of an industrial strength construction tool. It is precision set that can enables you work very fast and easily on tough materials like stainless steel and it does so without giving up the drilling speed. The result of utilizing this set of bits is a more efficient work operation with even less force used.

Every bit in the set is made of a pilot-point tip designed for high precision performance. This design greatly reduces “walking” on surfaces and also the need for pilot hole during start-up.

The DW1263 bits set comes in a size range of 1/16-inch to 3/8-inch with about 1/64-inch increment and a total of 14 drill bits in the set.

They are highly suitable for drilling through stainless steel as well as other metals. The wide range takes care of all the needs of almost all professionals. Corrosion and wear is something you hardly worry about as they are composed of cobalt alloy. The drills can effectively bore into very dense materials with ease. They are highly durable and can last for many years.

They come in a heavy-duty case which also aid in their transportation and organization. The ABS material is used in making the casing which ensures that it last long. Their industrial-grade construction greatly minimize the risk of damage they are being transported.  Everything stays intact and safe as a result of the sliding rubber lock and interlocking hinge.

Each bit comes with a holder and there is also a labelled slot for all of them. This helps greatly in identifying, accessing and organizing them. This drill set comes with a full 1-year warranty.


  • Their casing is made of tough ABS plastic and highly durable
  • Comes with a skidding rubber lock that ensures that the bits are intact and safe
  • Made to 135 degree split which enhances their precision
  • The Cobalt stainless steel ally gives industrial-strength
  • They have a full 1-year warranty.


  • The drill bit’s tips are not easily sharpened to increase their efficiency and life span
  • The tips of the bits gradually wear off very early especially on the smaller ones
  • The thinner ones may likely start denting sooner than expected
  1. Craftsman 9-64085 Professional Cobalt Drill Bit Set

In terms of durability, these are the world’s best drill bits. This is due to the fact that they are composed of a solid cobalt and steel structure. The set of 21 pieces are designed to fully withstand rough and heavy duty use. They are also incredibly wear resistant and are able to resist tear.

The Craftsman 9-64085 Professional Cobalt Drill Bits typically has a high-speed capacity during drilling operations. I discovered this is also the case even while working with thicker metals such as stainless steel and Titanium.

In addition to all the features above, their tip point design is really quite impressive. There is hardly any ‘walking’ as their split point design version drills instantly upon contact. There is consequently no need for pilot holes and you can get better drilling accuracy. They are very useful for performing repetitive drilling jobs.

The Craftsman 9-64085 Professional Cobalt Drill Bits casing is designed for easy storage and organization. The casing box is made of a high quality plastic construction and as a result is light weight. So no complaints in that department either!

You can notice that the split point of the Craftsman Drill Bits is very advance in design. This ensures that they are well balanced and eliminates the need for pilot holes.

Also, the entire set is compatible with both hand drill and drill press machines. So now you know what to expect from this particular model!

The only down side of the Craftsman 9-64085 Professional Cobalt Drill Bit Set is as a result of the lack of a notch at the end of each bit you have to apply constant pressure. This is necessary because penetration is much difficult when working on harder surfaces.


  • They are perfect for large-scale and repetitive operations
  • The Craftsman bits can also perform relatively well with rough and thick materials
  • Their casing makes it easy for storing and organizing them


  • The ends of the bits lacks a side notch for better penetration which means more pressure is required for harder surfaces
  1. Milwaukee 48-89-0026 14 Pc Cobalt Drill Bit Set

The Milwaukee 48-89-0026 14 Pc Cobalt Drill Bit Set is a 14-piece drill bit set which provides a long life span and is extremely durable. You will notice at first glance that these set of drill bits are quite unique and different from the standard bits. Their thicker core which gives them ultimate strength is one feature that makes them stand apart.  In addition the thicker core provides optimum protection against side-load breakage.

The tips of these bits are made of the 125-degree split feature. This ensures that you get a high precision start that is devoid of any walking. As opposed to the short standard bits, these set has longer drill bits which ensures extended reach, especially when accessing some hard-to-reach areas. They are specifically engineered for use on cast iron and stainless steel.

The speed of these drills is very impressive and they do not require more effort during operation. Since they have an extended length, you do not need to worry about curved surfaces. The sizes of the drill bits in this set ranges from 1/16-inch to 1/2-inch with a small increment for increased precision.

They come in a storage case which keeps them intact and safe. Every bit is labelled and has its specific slot for ease of identification and organization.


  • Thunderbolt web have long life span with faster drilling time.
  • Their parabolic flute clear chips faster
  • The 135 degree split point design ensures precision of operation
  • The 3-flat grip shank feature greatly reduces bit slipping in chuck


  • They do not have a warranty

Buyer’s Guide to the Best Cobalt Drill Bits

As far as drilling operation is concerned, there are several kinds of drill bits available. However, the effectiveness of every kind of drill bit depends on one factor. Can you guess this? It is simply the material you will be working with.

Taking that in account, you should also consider the strength and high performance of any best cobalt drills in working with harder materials such as stainless steel and Titanium. (Toolbox tips for drilling and fixing)

In general, these tools are made up of M42 and M35 quality cobalt steel structure. Which ensures that you get enhanced durability and heat resistant capacity? So now that you are aware of the 5 best to choose from, let’s also check out what the guide section has to offer.


The following important factors are to be taken seriously during the buying process.

  • Length

The life span or durability bits are also depended on the length. This implies that when there is an increase in the length of a bit, its toughness and durability decreases. In essence, the shorter the cobalt drill bits the more likely they are to withstand twisting, breaking and spinning.

  • Material

The type of material is a very vital factor to consider when you want to buy the best cobalt drill bits. This is true because the material determines if the bits will be heat resistant and tough. With this in mind it is best to get the drill bits with higher cobalt value.

  • Tip Point Design

This is a feature which is quite vital to the drill bit’s penetration capability. The available options include, brad point, V point, tapered point, and fish point. The most popular is the split point cobalt drill bit.

  • Size

In selecting drill bits, having a wide range of sizes is quite handy. In case you buy a set that includes several different diameters, you will have an added advantage. You will be able to use the device for different types of applications and jobs.



Purchasing some of the best drill bits ensures that you will save coat and not need to replace them for several year. The drill bit sets that we reviewed above are extremely durable, capable of easily drilling the densest and hardest materials efficiently. This review will help you make your purchase very easy.

Giving the wide range of options on the internet, locating the best cobalt drill is not very easy. The best way to make an informed buy is to take in account some very important factors. These factors include material, size availability, design, casing, tip point, heat resistance, and more.  That’s a lot to take in, am I right?

To reduce your stress and save you the trouble, we will provide you with the best option. It is simply the Irwin Industrial Tools Cobalt M-35 Metal Index Drill Bit Set. It scored the highest marks on all the factors we examined above. These drill bits satisfy many of factors to a high degree.


The Irwin Industrial Tools Cobalt M-35 Metal Index Drill Bit Set has a high speed, high quality cobalt construction. Their design ensures that they are resistant to abrasion and can work with tougher metals with relative ease and convenient. Their split-point style functions effectively well when it comes in contact with the surface.

Also, the rubber case meets up to your expectations. Consequently, the Irwin Industrial Tools Cobalt M-35 Metal Index Drill Bit Set provides the best features for high performance.


Robert P. has been a DIY, woodworking enthusiast for 5 years, and in that time has written huge resources on woodworking and tools. He loves solving problems and crafting ideas from scratch.

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