Countersink Drill Bit Set Adjustable Length Round Shank Punching

Countersink Drill Bit Set Adjustable Length Round Shank Punching

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Discriptions:This drill bit contains 5% Cobalt (M35 Cobalt HSS), which increases the strength, the tool life and makes it more heat-resistant. Rockwell Hardness >= 67. No center punch is needed. Fully ground spiral groove design clears particles quickly, decreases friction and heat for a faster and cooler drilling performance.

AugTouf 1/4 inch Cobalt Drill Bits(10Pcs), M35 HSS Metal Jobber Length Twist Drill Bit Set for Steel, Stainless Steel, Metal

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8mm 10mm 11PCS Shank HSS Counter Sink Drill Bit Punching drill Set for Woodworking Screws Countersinking Drills Carpentry Tool - AliExpress

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