3M Cubitron II 982C Coated Ceramic Quick Change Disc - 36 Grit - 4 1/2 in Dia - 13300 Max RPM - 27425 [PRICE is per DISC]3M Cubitron II coated 982C quick change disc uses ceramic as the abrasive material and has a diameter of 4 1 2 in. 3M incorporates this ceramic material into the quick change disc forming a grit of 36. All abrasive products that rotate or spin, such as the ones in this category, have a maximum speed at which you can run them. This 3M quick change disc can be run at a maximum speed of 13300. Sale Unit: DISC Brand: 3M Trade Name: Cubitron II Abrasive