✅ Countersink Drill Bit Set For Wood：4 Flute countersink cutter #45 Carbon Steel tapered countersink set 5 sizes drill bits with countersink #4 (7/64"), #6 (9/64"), #8 (11/64"), #10 (3/16"), #12 (7/32") Adjustable wood countersink, 1 Hex Wrench (1/8" Allen Key) counter sinker drill bit for wood. Counter-bore, and wood plugs size 3/8". Hex shank compatible with 1/4 inch standard Quick Change chuck including impact drills..✅ High Quality Material：The counterbore drill bit is made of high-speed steel, with high hardness, wear-resisting, not easy to break, not easy to rust, and provides excellent cutting ability. The chamfering device is made of high carbon steel, strong and durable..✅ Conical Design：Sharp taper twist bit charmer 82 degrees, cutting faster, can quickly and cleanly drill smooth holes. And to ensure a close fit with the screw, it is easier to locate the hole and the drill bit. Even after repeated use, the countersink bits remain sharp and work effortlessly..✅ Adjustable：Best adjustable wood countersink drill bits set ideal for woodworking. The high-quality countersunk hole is fixed on the plane of the handle by the hexagon socket screw to prevent loosening to ensure a firm fit, and can be adjusted to control the depth of the guide hole..✅ Wide Range of Applications：Countersink drill bits are suitable for bench drills, hand drills and conventional electric drills. Compatible with all 1/4 inch quick change chucks, including impact drills Wood countersink bit with wider flute shape for increased chip flow. Bits secured with pin Never Come Loose from shank.