These 10pcs electric polishing kits are designed for DIY polished engraving, cutting, polishing (wood, metal, mold polishing). These are high quality 3mm high speed steel burrs for electric grinding accessories. Features: Our electric polishing kits include high speed steel rotary burrs, grinding head and 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 with a small grinding wheel and no 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. Specifications: Color: Silver Material: High Speed Steel 4241 Hardness: HRC 60 Type: Woodworking Milling Cutter 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 NOTE: 1. When the HSS rotary tool works on a pneumatic or electric tool, the rotation speed is usually 6000-440,000 rpm, so you need to clamp the tool tight. 2. The cutting direction is from right to left even in motion, unlike the grinding wheel used for reciprocating cutting; be careful not to apply too much force (the pressure is usually less than 4 kg). Suitable Applications: Carving metal and non-metal surfaces. Processing cast iron, cast steel, carbon steel, alloy steel, stainless steel, copper, aluminum and other metals; Milling marble, jade, bone and other non-metallic materials. Using engraving machine or mini drill, various shapes of cutting/engraving. Package List: 10 * Steel Rotary Burrs