The length of the drill bit has a significant influence on this, with a longer shaft being more breakable, while shorter ones are stronger. IRWIN Drill Bit Set with TurboMax Bits & Case, 29-Piece (3018006B) Visit the Irwin Store 4. It covers all fractional sizes from 1/16 of an inch through 1/2 of an inch by 64ths. Century Drill & Tool 26121 Pro Grade M35 Cobalt Steel Drill Bit Set, 21 Piece, Stainless Steel Drill, Made in The USA. This is the industry standard 29 piece set. IRWIN Drill Bit Set, M35 Cobalt Alloy Steel Steel, 29-Piece (3018002) 4.7 out of 5 stars 1,869. Their cobalt content makes them more brittle, which means they are prone to snapping under pressure. Irwin Tools Cobalt Reduced Shank Drill Bit Set - Consider. This isn’t to say that cobalt drill bits are without flaws. Metal becomes blunt far more quickly when it is hot, so preventing it from overheating will make a significant difference to its durability. M35 refers to 5% cobalt, whereas M42 has the highest cobalt content at 8%.Ĭobalt is strong and heat-resistant, so it is ideal for coping with the demands of drilling through iron, steel, and even titanium. These bits are graded as M35 or M42 depending on how much cobalt they contain. 29-Piece M42 Cobalt HSS Metal Index Straight Shank Fractional Drill Bit Set - Part Number 3018002B by IRWIN.
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