Polycarbide abrasive wheel with shaft Application for the removal of rust, paint and flaking materials,manufactured by nylon cord with polyurethane coated with emery Dia. 50mm and 75mm;2" and 3" Dia. of shaft: 6mm or 1/4" Thickness: 13-15mm Black ---- Rapid grinding wheel : Removal of general coating and polishing the surface , can be used in stainless steel , mild steel , aluminum, plastics , cement , wood and stone surfaces Blue, purple ---- efficient grinding wheel : more powerful than black products, but not limited to the following purposes . Dark rust removal , polishing surface ablation is serious , clean concrete surface can be used for ships, bridges industry. can be produced according to customer's requirement. Warning:ear, eye, face and body protection