Heavy Duty Drill Bits
Heavy Duty Drill Bits: Metal, Masonry & Concrete
Adiseal Ultimate metal and masonry drill bits are heavy duty drill bits that have been shown to be the fastest and most durable bits in our tests. The range includes the strongest metal drill bit and strongest masonry drill bit. These patented drill bits drill into hard materials like hard steel, concrete, masonry, brick and many other construction materials.
Heavy duty metal drill bit test procedure
To find out what are the best heavy duty metal drill bits, we conducted rigorous tests using a Scheppach DP60 drill press to find the top-performing heavy duty metal drill bit. The objective was to drill 10mm holes in 6mm thick stainless steel (SUS304). Throughout, the drill press maintained a steady 400 rpm. Using 10mm metal cobalt drill bits from renowned brands like Milwaukee Cobalt Red, DeWalt Extreme, Bosch Cobalt, and Makita. To ensure consistency, a 5kg weight was affixed to the drill press arm for uniform force and RPM.
Tests were executed without lubricants or coolants, despite their potential to reduce heat and prolong bit life. The entire drilling process was meticulously recorded via video timestamps which are available on request for verification purposes. Following the trials, the Adiseal Ultimate drill bit emerged as the best metal drill bit, outperforming all rivals in holes drilled and time taken per hole.
Heavy duty metal drill bit durability test results
| 10mm metal cobalt drill bit | Total number of holes drilled (in 6mm stainless steel) |
| Adiseal Ultimate cobalt | 135 holes |
| Milwaukee cobalt red | 75 holes |
| DeWalt Extreme cobalt | 39 holes |
| Bosch cobalt | 15 holes |
| Makita cobalt | 12 holes |
The Adiseal Ultimate metal drill bit outperformed Bosch’s best bit by drilling 9 times more holes and surpassed DeWalt’s top bit by over 3 times in hole count.
Heavy duty metal drill bit speed test results
The Adiseal Ultimate heavy duty metal drill bit not only showcased superior durability but also demonstrated remarkable drilling speed. We tracked the time taken to drill each hole for the first 10 holes and averaged the results. The Adiseal Ultimate bit consistently outpaced all other bits, significantly reducing drilling time and showcasing its remarkable efficiency.
| 10mm metal cobalt drill bit | Average time to drill each hole (in 6mm stainless steel) for first 10 holes |
| Adiseal Ultimate cobalt | 31.7 seconds |
| DeWalt Extreme cobalt | 38.5 seconds |
| Milwaukee cobalt | 55.8 seconds |
| Makita cobalt | 69.9 seconds |
| Bosch cobalt | 132.4 seconds |
Adiseal Ultimate proved to be over four times quicker than Bosch’s top cobalt bit, substantially minimizing drilling time and effort.
Please note, these are our test results from internal testing. We recorded a video of each hole being drilled. These videos are available on request for your test accuracy verification purposes.
It’s important to mention that various non-cobalt drill bits, such as the Milwaukee Thunderweb, were assessed but not included in the chart to maintain fairness. For instance, the Bosch PointTeq bit couldn’t penetrate the 6mm thick stainless steel during the tests so it didn’t manage to drill any holes at all.
Heavy duty masonry drill bit
The Adiseal Ultimate range features the fastest no-hammer masonry and multi-material heavy duty drill bit, proven to be the top performer in terms of drilling speed without utilizing the hammer function. This gives it significant advantages over traditional hammer drills. Its capabilities extend to drilling into various materials like brick, concrete, wood, and a diverse range of building materials, making it the top choice among carbide drill bits with a hex shank for masonry tasks.
What materials can they drill
Masonry and multi-material bits
Adiseal Ultimate heavy duty carbide masonry drill bit & multi-material drill bit can drill into many different materials including:
Metal bits
As well as Adiseal Ultimate being heavy duty drill bits for hard steel, it is also suitable at drilling many other materials including:
- Stainless steel
- Hardened steel
- Metal
- Aluminum
- Bronze
- Brass
- Copper
- Cast iron
- Plain carbon steel
- Wood
- Plastic
- Fiberglass
- Plus many other materials
Where to buy heavy duty drill bits
In the UK to buy heavy duty metal drill bits or to buy heavy duty masonry drill bits, please contact us for details of your local stockist. For other countries, please visit www.guglue.com
Frequently asked questions about the best drill bits
Heavy-duty drill bits are built for tough tasks and robust materials. Made from durable substances like cobalt, carbide, or high-speed steel (HSS), they’re designed to tackle challenging surfaces such as metal, hardwood, concrete, or masonry. With special coatings and tips, these bits endure high stress, retaining sharpness and performing reliably, even in demanding drilling situations, ensuring they stay effective over extended use.
Heavy-duty drill bits are designed to withstand high-torque applications and are often made from tougher materials like cobalt, carbide, or titanium-coated steel. These materials make them ideal for drilling through hard surfaces like metal, concrete, masonry, and dense wood without quickly dulling or breaking. Heavy-duty bits also feature reinforced shanks and specialized tip designs, which improve precision and durability under challenging conditions.
Heavy-duty drill bits are ideal for hard materials like stainless steel, cast iron, concrete, masonry, and hardwoods. Their durable construction allows them to handle high-resistance materials without dulling or breaking, making them perfect for demanding applications in construction, metalwork, and other heavy-duty projects.
Suhail Matadar
Suhail Matadar has extensive experience in the construction industry as an electrician, involved in installing, inspecting, and testing electrical systems in various projects. He excelled in sales, working for a major UK wholesaler, selling construction products to professionals and the DIY market. Suhail's background includes working at a leading home emergency repair company dealing with trades people. With a BEng (Hons) degree in Electronic Engineering, Suhail has worked with PLCs in the nuclear fuel manufacturing industry. During his studies, he gained practical experience at a chemical manufacturing company known for producing award-winning cleaning, hygiene, and livestock protection products for over a century. Currently, Suhail runs a global business specialising in supplying, researching, testing, and distributing chemical construction products like adhesives and sealants.