This 10-piece electric polishing kit is specially designed for engraving, cutting, polishing (wood, metal, mold polishing) DIY polishing. These are high-quality 3mm high-speed steel cutters for electric grinding accessories. Feature: Our electric polishing kits include high-speed steel rotary burrs, grinding heads, and rotary cutting tools. It is suitable for processing cast iron, cast steel, carbon steel, alloy steel, stainless steel, copper, aluminum and other metals, as well as marble, jade, bone, non-metals, etc. The small grinding wheel can be replaced, no dust pollution. High working efficiency, good grinding effect, and long service life. Use a small grinding wheel instead to avoid dust pollution. Grinding is convenient, simple to use, safe and reliable. Feature: Silver Material: 4241 High Speed Steel Hardness: HRC 60 Type: Wood Saw Shank Diameter: 3mm Total Length: 40mm Item Weight: Approx. 27g/0.97oz Package Size: Approx. 8*3*1.1cm/3.15*1.18*0.43in Package Weight: Approx. 30g/1.06oz Comment: 1. When high-speed steel rotary tools work on pneumatic or electric tools, the speed is generally 6,000-440,000 rpm, so the tool should be tightly clamped. 2. The cutting direction when moving is from right to left, which is different from the grinding wheel used in reciprocating cutting, be careful not to apply too much force (the pressure is generally less than 4kg). Applicable applications: Carving on metal and non-metal surfaces. Processing cast iron, cast steel, carbon steel, alloy steel, stainless steel, copper, aluminum and other metals; Milling non-metallic materials such as marble, jade and bone. Various shapes of cutting/engraving using an engraver or mini drill. Packing list: 10 * steel rotary cutter