9 Best Cobalt Bit Sets For Hard Steel【Updated 2021】

best cobalt drill bits

Cobalt drill bits are used for hard steel metals. Not just that we can not deny the fact that we require the best cobalt drill bits for many house projects. Therefore, it is mandatory to know what materials in manufacturing and is best to perform the tasks.

The 9 top picks are shared on the basis of personal and Amazon’s preference. I have been a DIYer for years now, and I try to help others in the best possible way. So let us start reviewing the products by keeping in the mind out project.

9 Best Cobalt Drill Bits 2021:

Snow BlowersRatings
Irwin Drill Bit Set10/10 [Editor's Choice]
Bosch Bit Set8.5/10
DeWalt Cobalt Drill Bit Set9/10
MaxTool M42 Drill Bit Set9.5/10
Drill America M35 Cobalt Drill Bit Set9/10
Drill Hog M42 Bit Set8.5/10
Milwaukee Helix Drill Bit Set7/10
Chicago Latrobe Drill Bit Set7.5/10
Neiko Drill Bit Set8/10

Choose from the list below the best cobalt drill:

1:Irwin Drill Bit Set

Why we love it:

bosch cobalt drill bit set

  • Plenty of sizes available
  • Cuts sharp in hard metal
  • Higher durability

✅ Extensive range of sizes❌ The printed labels are hard to read
✅ Excellent for hardened materials
✅ Quality just what the brand promises

2:Bosch Drill Bit Set

irwin cobalt drill bit set

Why we love it:

  • 21 pieces set
  • Cobalt alloy material
  • Best used for stainless steel, titanium, aluminum, and iron

✅ Rigid design not prone to damages❌ Extremely hard to read the label
✅ Exceptional grip
✅ Drills like butter

3:DeWalt Cobalt Drill Bit Set

bosch cobalt drill bits

Why we love it:

  • 14 pieces set
  • Excellent for drilling in hard materials
  • Full control over the movement of the bit

✅ Sharp and extremely durable❌ Requires oil when drilling on metal
✅ Allows user control
✅ Reliable storage case with slid opening and closing

4:MaxTool M42 Cobalt Drill Bit Set

irwin drill bit sets

Why we love it:

  • Wide range of sizes with 29 pieces
  • Supports high accuracy
  • Made from 8% cobalt

✅ High speed and productivity❌ The bits will get dull after several holes if the oil is not used
✅ 135 degrees cutting angle
✅ Avoids corrosion and last years

5:Drill America M35 Cobalt Drill Bit Set

where to buy cobalt drill bits

Why we love it:

  • Exceptional durability
  • Higher stability and sturdy bits
  • Minimal clogging

✅ Every bit has a split point❌ To achieve smooth results, the speed must be consistent and carefully measured
✅ Gold oxide coating extends life
✅ The case has clear markings for easy identification

6:Drill Hog M42 Bit Set 

drill hog website

Why we love it:

  • 21 pieces
  • M42 cobalt steel material
  • Lifetime warranty

✅ Spin resistant❌ There is no coating on the bits
✅ Excellent for hard metal
✅ Smooth results guaranteed with slow speed

7:Milwaukee Helix Drill Bit Set

1/2 inch cobalt drill bit

Why we love it:

  • 29 wide-ranged bit pieces
  • Perfect for cast iron and steel
  • Splinter free holes

✅ Long-lasting and worth the money bits❌ Not suitable for wood
✅ 135 degrees tip
✅ User friendly

8:Chicago Latrobe Drill Bit Set

drill bit shank identification

Why we love it:

  • 29 pieces
  • Incredible Gold Oxide Finishing
  • 135 degrees angle cutting

✅ Provides most useable sizes from 1/16 inches to 1/2 inches ❌ The labels can be confusing sometimes
✅ Thick web for higher durability
✅ Heat and Wear-resistant

9:Neiko Drill Bit Set

milwaukee cobalt drill bit set

Why we love it:

  • Ten pieces
  • Multi-purpose usage
  • High-quality Spiral flutes design

✅ Excellent for metals❌ Not suitable for soft materials
✅ High-speed fortified steel used in the manufacturing
✅ Increased productivity

Benefits of Cobalt Drill Bits

To have cobalt drill bits is to have the option to perform tasks whenever you want. There are plenty of benefits of these bits, let us go through them one by one.

Drilling in hard materials

Majorly the world’s best drill bits are used to bore through heavy materials. Hence if you have to drill in materials such as titanium or metal, you must own a set of cobalt steel drill bit. These bits are manufactured from equally high-quality material to last years.

It is recommended to buy an M35 or M42 grade bit; it is incredibly durable.

More usage options

The cobalt drill bits come in sets. Therefore with a single purchase, you are equipped with numerous sizes. These complete range sized bits are suitable for different applications.

You can easily connect them, and they work fluently. Unless there is a wrong fitting, you will never experience unwanted or wrong twisting. Before drilling on the material, try it on a rough surface first; this will prevent you from wastage of resources.

Easy to use

The cobalt drill bit set is more comfortable to use. These bits are highly recommended for in-house projects; as it was easier to use and carry.

With the manual and guide, the user can immediately learn how to do the work. In addition to that, the bits are numbered clearly to give you an experience of easy identification of bit for the required task.

Furthermore, if you a genuine DIYer, it is the best tool that you can have. Moreover, these exceptional bits can fit in the standard drill gun.

Do not confuse drill with an impact wrench or impact driver. Understand the difference by clicking Impact Driver vs. Impact Wrench.

Types of Cobalt Drill Bit Set

There are plenty of cobalt drills available in the market. However, if you do not have the basic understanding, you might end buy purchasing the wrong set.

Check out the types of bits to get the perfect one for yourself.

Twist Drill Bits

It is one of the most common types of cobalt drill bits. You can see this being used commonly in most projects. Because it comes in a large variety of sizes. Not just that it works best on many materials including wood, plastic, and metal

In addition to that, the durability of these bits is supported by the coating of metal oxide. It makes the bit heat resistant. Hence you can keep drilling for long projects without worrying about it.

Countersink Drill Bits

If your projects are surrounded by wood, then this is the best one for you. These bits are mainly made for drilling in wooden surfaces. The bit has higher stability and doesn’t twist or spin. However, it requires a pilot and middle hole for working correctly.

Counterbore Drill Bits

These bits are made to drill in wood and plastic. The bits have an entire flat bottom and a tiny hole best for drilling at different surfaces. However, these bits do not have any coating but made from cobalt steel; hence increasing productivity with higher speed.

Note these bits are not made for working on steel.

Cobalt Step

These bits can be used to drill through both metal and wood. The steps in these bits can be used to get holes of different diameters.

Since we are talking about drill, it is best for you to see the top-rated brand point drill bits.

Buying Guide

If you are a beginner, you have to go through this guide as these are the main factors one must consider before making the right purchase.


The price of the bit set is the primary derivative of the quality and the number of items it offers. Suppose you are planning for your first purchase to be budget-friendly then you can choose M35 bits. These bits work on many surfaces and usually comes in a pack of 15-20 bits. However, the durability is not very much supported under $50.

But if have funds to support your DIY projects you should opt for M42 cobalt drill bits. Not just the bits but the case it comes in is equally durable.


The quality is dependent on the price you are willing to pay for the bits sets. In addition to that, you can read the reviews separately on Amazon to see how the user finds your potential product.

One thing I can assure you is that the Cobalt drill bit sets mentioned above are of high quality and extreme durability.


Before purchasing always look for the size, the set is offering. In addition to that, if you only require one bit, you do not need to buy a whole set unless you have plans to do other DIY projects as well.

Building on my experience, I will highly recommend shorter bits. Longer bits are prone to spinning and twisting hence resulting in breakage. However, shorter bits are closer to the tool, therefore more durable.

The other aspect is the diameter if you want deeper holes to go for twist bits instead of step bits.

Percentage of Cobalt

The higher the percentage of cobalt in the set, the better it is. Most commonly there is a 5% cobalt which is also durable. However, by getting M42 bits, you get an 8% cobalt alloy. Therefore, you get the highest quality product with maximum durability.


The tipping point plays a significant role. You have to choose the tipping point according to the work you are planning to do. For instance, if you want to use it on thicker metals, you will require a split-point. However, there are plenty of options to choose from, such as V-point, brad-point, and fish-point.

Check the brands to choose one from Kobalt vs. craftsman and Ryobi vs. Ridgid.

Additional tips

Since you have spent money, there is no need to replace the bits immediately after they stop giving the smoothest cuts. But you have the option to get them sharpened. In this way, you are saving money as well as keep using the bits that you are comfortable with.

Furthermore, Cobalt drill bits are powerful. Hence use them for metals instead of wood.

No matter what object you are using these bits never forgets to wear goggles. While drilling, there are very tiny particles that can go to your eyes and cause severe injuries, and we do not want that.

You should explore the best Forstner bit set to see if it is suitable for your projects. 


Is cobalt or titanium drill bits better?

Bits that are coated with titanium have higher durability and last for very long. However, Cobalt bits are not for everyday purposes but drilling through hard materials.
Alongside that there is a huge debate about the masonry bits, if interested, check the reviews here.

Are cobalt drill bits worth it?

Cobalt drill bits last longer and worth the money you will spend. Undoubtedly high-quality bits are costly, but this is what you require and will stay with you for your extended projects.

Can I use Cobalt drill bits on the wood surface?

Cobalt drill bits can be used extensively on different surfaces. However, for wood, I would urge you to use a standard drill as cobalt is made for tough metals. In addition to that, these are highly powerful and result in wood that might not be the same as you wanted.


The choice of the bit depends on the user’s projects. Remember, spending some dollars to have a superior quality bit is better than spending now and then for new bits.

In addition to that, let us not forget the purpose of Cobalt bits; drilling through tough metals.

Therefore, using them on soft materials can result in a mess. My recommendation is to go for bit sets having 5-8% cobalt value. It is the assurance of longevity.

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