These 10 electric polishing kits are designed for engraving, cutting, polishing (wood, metal, mold polishing) of polished DIY. These are high quality 3mm high speed steel burrs for electric grinding accessories. Features: Our electric polishing kits include burs high speed steel rotaries, a grinding head and a rotary cutting tool. 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. Can be replaced by a small grinding wheel and without dust pollution. High working efficiency, perfect grinding effect and long service life. at the base, replace it with a small grinding wheel and avoid dust pollution. Convenient to grind, simple to use, safe and reliable. Features: Color: silver Material: High speed steel 4241 Hardness: HRC 60 Type: Wood milling cutter Diameter of the shank: 3mm Total length: 40mm < /p> Item weight: approx. 27g / 0.97oz Package Size: Approx. 8 * 3 * 1.1cm / 3.15 * 1.18 * 0.43in Weight of package: approx. 30g / 1.06 oz NOTE: 1. When HSS rotary tool works on pneumatic or electric tool, the rotating speed is generally 6000-440,000 rpm. So you need to tighten the tool tight. 2. The cutting direction is from right to left even when moving, unlike the grinding wheel used for reciprocating cutting; be careful not to force too much (the pressure is generally less than 4 kg). < p>Suitable applications: Sculpture of metallic and non-metallic surfaces. Processing of cast iron, cast steel, carbon steel , alloy steel, stainless steel, copper, aluminum and other metals; Milling of marble, jade, bone and other non-metallic materials. Using an engraving machine or mini drill, various forms of cutting/engraving. Package list: 10 * steel rotary cutters