"These 10 electric polishing kits are designed for engraving, cutting, polishing (wood, metal, mold polishing) polished DIY. They are high quality 3mm high speed steel burrs for 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 carbon, 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 work efficiency, perfect grinding effect and long service life.Basically, replace it with a small grinding wheel and avoid dust pollution.Convenient to grind, simple to operate , safe and reliable Specifications: Color: silver Material: High Speed Steel 4241 Hard Summer: HRC 60 Type: Wood Cutter Shank Diameter: 3mm Overall 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 is working on pneumatic or electric tool, the rotating speed is usually 6000-440000rpm. So you have to clamp the tool tight. 2. The cutting direction is right to left even in motion, unlike the grinding wheel used for reciprocating cutting; be careful not to force too much (the pressure is generally less than 4 kg). Suitable Applications: Sculpture of metallic and non-metallic surfaces. Processing 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 a mini drill, various forms of cutting / engraving. Package List: 10*" Steel Rotary Cutters