
Premium Quality: These taper drill bits are made of high quality alloy steel, offering superior cutting power. High hardness and wear resistance, convenient and fast drilling a hole Various Sizes: The drill bit sets include 5 kinds of sizes: 2.8x8mm/3.0x8mm/3.2x8mm/3.5x8mm/4x8mm. Removable and Adjustable: Remove the screw with the included wrench and adjust the length of the countersunk hole to adjust the drilling length of different length screws. These drill bits are a great help in our daily life and improve your work efficiency. Multiple Uses: Used for wood, plastic, soft metal, fiberboard, aluminum alloy screw cutters, holes, etc. Function: Faster cutting and chip removal, no need to replace the drill bit to achieve fast and smooth countersinking