1LONG LASTING MATERIALS: The taper countersunk bit is made of excellent 40 Cr V steel and high speed steel material, exquisite workmanship, long lasting 2CHIP REMOVAL AND BENDING STRENGTH: The taper countersunk bit has good chip removal effect, strong bending strength and wear resistance, stable and reliable 3FAST AND EFFICIENT: The cone countersunk bit will quickly discharge the cuttings in the hole, which can effectively prevent the retention of cuttings and improve the drilling efficiency 4FLEXIBLE AND ADJUSTABLE: Countersunk chamfered bit with adjustable limits to meet a variety of countersunk and drilling requirements. A total of 5 colors, one color corresponds to one drill size, easy to distinguish 5WIDE APPLICATION: Wood countersink drill bit can be used for drilling wood, plastic, soft metal, fiberboard, aluminum alloy screws and other materials, simple and practical 5 x Countersink Set(with limiter) 4 x Limiting Screw 2 x Hex Wrench