Feature:1. LONG LASTING MATERIALS: The taper countersunk bit is made of excellent 40 Cr V steel and high speed steel material, exquisite workmanship, long lasting2. CHIP REMOVAL AND BENDING STRENGTH: The taper countersunk bit has good chip removal effect, strong bending strength and wear resistance, stable and reliable3. FAST 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 efficiency4. FLEXIBLE 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 distinguish5. WIDE APPLICATION: Wood countersink drill bit can be used for drilling wood, plastic, soft metal, fiberboard, aluminum alloy screws and other materials, simple and practicalSpecification:Item Type: Countersink Drill Bit SetMaterial: 40 Cr V steel, high speed steelDrill Bit Sizes: Red: Approx. 2.8mm / 0.11in, Yellow: Approx. 3.0mm / 0.12in, Dark Blue: Approx. 3.2mm / 0.13in, Green: Approx. 3.5mm / 0.14in, Purple: Approx. 4.0mm / 0.16inProduct includes depth stop rings for adjusting drilling depthShank Diameter: Approx. 8mm / 0.31inCountersink Diameter: Approx. 8mm / 0.31inPackage List:5 x Countersink Set(with limiter)4 x Limiting Screw2 x Hex WrenchNote:Please allow tiny size error due to manual measurement. Thanks for your understanding.