Metric M42 8% Cobalt Twist Drill Bits Set (1mm-10mm, 19pcs)

In this review the Metric M42 8% Cobalt Twist Drill Bits set is evaluated for metalworkers and serious DIYers who need a durable set for stainless steel and other hard metals. The bottom line: the set delivers exceptional wear and heat resistance thanks to the M42 8% cobalt steel, and the 135 degree split point plus three-step flute design makes it a reliable choice when drilling tougher materials where accuracy and long tool life matter.

Key Features

• M42 8% cobalt steel: provides increased heat and wear resistance so bits last longer when cutting stainless steel and hard metals.
• 68-70 HRC hardness: gives the set the rigidity to resist dulling and maintain cutting performance under heavy use.
• 3-step flute design: engineered to cut through stainless steel, aluminum, plastic and other hard materials with cleaner chip evacuation.
• 135 degree split point: reduces walking and starts drilling precisely on contact, improving hole placement in metal.
• Incremental sizes 1mm to 10mm: the 19-piece range in 0.5mm increments covers fine to larger holes without guessing between sizes.
• Longer lengths on larger bits: selected diameters have extended lengths for deeper holes or use in drill presses.

Who It's For

This set is aimed at fabricators, maintenance technicians, and experienced DIYers who regularly drill stainless steel, hardened alloys, or other metals and need bits that run hotter and cut faster than standard HSS. The M42 cobalt composition and higher hardness make it suitable for repeated production work where downtime from dull bits is costly.

Hobbyists who only drill softwoods or occasional plastics may find this set overbuilt and can save by choosing general-purpose high speed steel bits instead. Also, users looking for metric sizes smaller than 1mm or specialty coatings should look elsewhere.

Pros & Cons

Pros

• Excellent heat and wear resistance from the 8% cobalt M42 composition.
• Split point and flute geometry reduce walking and produce cleaner chips.
• Wide metric range in fine 0.5mm steps covers common hole sizes for metalwork.
• Long tool life lowers cost per hole compared with standard bits.

Cons

• Higher initial cost versus basic HSS sets, though offset by longer life.
• Lacks a plastic or metal case in the listing, so storage and organization depend on the buyer.

Specifications

Our Verdict

The Metric M42 8% Cobalt set is a solid value for professionals and serious hobbyists who drill stainless steel and hard metals frequently. Its combination of M42 cobalt, split point geometry and fine metric sizing delivers reliable starts, fast cutting and extended life that reduce overall operating cost. Buy this set if you need durability and precision in metalworking applications.

Frequently Asked Questions

Are these bits suitable for stainless steel?
Yes; the M42 8% cobalt composition and 135 degree split point are designed specifically to handle stainless steel and other hard metals.

Do these bits come in very short lengths only?
No; the set includes varied lengths with larger diameters supplied at longer lengths for deeper holes.

Will they work in cordless drills?
They will work in cordless drills, but for best life and accuracy use steady speed, proper feed and cooling when drilling hard metals.