1PCS 4mm-13mm Cobalt Drill Bit, 400mm Extra Long M35 HSS Twist Drill Bits For Hardened Metal Plastic And Wood(4mm 1pc)

Twist drills are made of high hardness, wear-resistant HSS + M35 cobalt. The double spiral edge design accelerates chip removal, avoids clogging and improves drilling efficiency. The addition of M35 cobalt improves the durability of the drill under high temperature environment and prolongs the service life. Suitable for drilling hard metals such as stainless steel, alloy steel, cast iron, etc., and can also quickly drill through soft materials such as wood and PVC. Self-centring design to improve efficiency, high hardness, wear resistance and long service life.