6 PCS: 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 perage. rust-proof cutting edge this cutter is made of HSS fast steel, of high hardness and does not rust easily. Its edge is hardened and ground, so it is sharper and its service life is longer. Note: if you use a milled head drill on a hand drill, use a chopper drill? Dal to drill the hole, then use a milled head drill so as to avoid any risk of ballooning caused by drilling. more processing materials : 6 PCS walnut cutters allow chamfering the edges of holes. The tapered cutters can process different materials such as hard wood and cork, aluminum foil, plastic, PVC and light iron. This beveling cutter is suitable for all kinds of machine tools chamfering design : the chamfering cutter adopts the suitable Angle of inclination design, anti-rust and anti-corrosion, beautiful and delicate, conferring the strength and rigidity of the sharp edge cutter, the sharp increase of the cutter, the processing properties of cutting and milling. application area : this kit per? Age with drowning head is suitable for diy at home and everyday. It can be drilled easily and efficiently, not only without burrs, but also without scratches.