?PREMIUM QUALITY: This countersink drill bits are made of 45# standard high-carbon steel with super-hard titanium plated. The Automatic Center Punch made of pure brass to mark a starting work piece with a dimple.
? WIDELY USED: Drill bits mainly used for wood openings, reaming, chamfering, screw head and so on. Also applies to MDF, plywood, acrylic, PVC board and soft metal such as aluminum, copper and so on.
? GOOD WORKING: Five-blade chamfering with a groove, easier to discharge debris and the High Carbon Steel Drill Bit not easy to blunt. In addition, standard 1/4'' Hex Shank, a variety of specifications. The Automatic Center Punch delivering an automatic spring-driven strike when pressed against surface, it can be adjusted cap regulates striking force.
?SURFACE TREATMENT: For increasing the surface hardness, the whole Drill Bits is using high-frequency quenching for heat treatment, high-density grinding, with titanium to prevent rust. High Hardness, Good Toughness, High Concentricity.
?WHAT YOU GET: Package includes 1 Pcs automatic pure brass center punch and 6 Pcs drill bits with various sizes. 6mm / 0.23'', 8mm / 0.31'', 9mm / 0.35'', 12mm / 0.78'', 16mm / 0.98'', 19mm / 0.74''.