High durability-This countersunk bit set is made of classic metal with a hardness of HRC 62-64; it provides cutting , high durability and good wear resistance. True 82 : These pilot screw countersunk heads are designed to match the commonly used woodworking 82 screws you may encounter in the U.S. and Canada -cleaning: The drill bit is precisely installed in the sink casing, and the two chamfered grooves enable 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 into a one-step operation. This can create perfect countersinks for flush and -in screws, will not split the wood, and enjoy projects with a drill set Multifunctional use: Comes with 5 replaceable drill , which can cover screws of sizes. Countersunk drill are suitable for bench drills, manual drills and 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 are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.