6PCS: 6 PCS Chamfer Cutters are available in six different diameters of 6.3mm/8.3mm/10.4mm/12.4mm/16.5mm/20.5mm. Different diameters can be used for drilling. Sharp anti-rust This cutter is made of HSS high speed steel, high hardness and not easy to rust. Its cutting edge is hardened and ground, so it is sharper and has a longer service life.NoteIf you use a countersunk drill on a hand drill, use a twist drill to drill the hole, then use a countersunk drill so as to avoid any risk of sloshing caused by drilling. More processing materials: 6 PCS walnut router bits help chamfer the edges of holes. The tapered router bits can process different materials such as hardwood and cork, aluminum foil, plastic, PVC and light iron. This chamfering cutter is suitable for all kinds of machine tools Chamfering design: The chamfer cutter adopts the appropriate tilt angle design, anti-rust and anti-corrosion, delicate bet, imparting the strength and rigidity of the sharp edge cutter, the strong increase of the cutter, the processing properties of the cutting and milling. Scope of application: This countersunk drill kit is suitable for home and daily DIY. It can be drilled easily and efficiently, not only without burrs, but also without scratches.