3m Cubitron 47097.3M Cubitron II Hookit coated 775L hook & loop disc uses precision shaped ceramic grain as the abrasive material and has a diameter of 5 in. 3M incorporates this precision shaped ceramic grain material into the hook & loop disc forming a grit of 240. To aid in dust control, this product is designed to work with vacuum systems and comes with Multi-hole holes built into the Hook & Loop Disc. This product is on a film backing, C weight. 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 hook & loop disc can be run at a maximum speed of 12000 RPMs