Two 150 mm x 12.7 mm polishing and polishing wheels with centre hole reinforcement. Diameter: 150 mm face, 12.7 mm pin hole. Easy to install: 12.7 mm centre hole fits most table grinders and polishers. The polishing wheels make your work easy and effortless and also improve work efficiency. Stitched design: the sewing style makes these polishing discs robust and is perfect for cutting and polishing [Usage] Polishing discs are perfect for brass, aluminium, bronze, stainless steel, chrome, cast iron and other metals. The speed should be below 3600 min., Weight: 0.50596089129 Pounds, Manufacturer: Jaywool