INGCO 9-inch Abrasive Metal Cutting Disc pack designed for heavy-duty cutting on metal and stainless steel (Inox).SpecificationsSize: 9 inches (230 mm) diameter, 2.0 mm thickness, 22.2 mm (7/8") boreMax Speed: 6,650 /min (80 m/s)Design: Flat center / depressed wheel type suited for standard angle grinders bulk box of 50 pieces