High durability-This countersunk bit set is made of classic metal with a hardness of HRC 62-64; it provides excellent cutting ability, high durability and good wear resistance. True 82 angle: These pilot screw countersunk heads are designed to match the most commonly used woodworking 82 screws you may encounter in the U.S. and Canada Self-cleaning: The drill bit is precisely installed in the sink casing, and the two chamfered grooves enable faster operation and automatic cleaning of the drill bit, thereby forming a hole of perfect size and shape Perfect your carpentry-the 2-in-1 design turns a two-step immersion into a one-step operation. This can create perfect countersinks for flush and push-in screws, will not split the wood, and enjoy neat projects with a drill set Multifunctional use: Comes with 5 replaceable drill bits, which can cover screws of various sizes. Countersunk drill bits are suitable for bench drills, manual drills and traditional electric drills. They are perfect for wood, fiberboard, particleboard, plywood, plastic, PVC, rubber, etc. colour: black Material: metal Package Contents: 1 set x conical drill bit Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.