grinder

Common types of grinding wheels
Brown fused alumina grinding wheel (code A): suitable for grinding cast iron, hard bronze, carbon steel, alloy steel, etc.
White fused alumina grinding wheel (code WA): suitable for grinding drill bits, stainless steel, high-speed steel, hardened steel, etc.
Green silicon carbide grinding wheel (code GC): suitable for grinding hard and brittle materials such as cemented carbides and glass.