Remove Deep Scratches From Glass - Now you can recondition deeply scratched automotive glass and save the replacement costs. This abrasive system literally grinds away imperfections until scratches disappear. Works with your 4 1/2in. or 5in. air angle grinder set at 2000 rpm. WARNING: This System Removes Glass. Keep Glass Wet With Water and Spinning Abrasives Moving Across Entire Surface to Avoid Heat Build-Up and Optical Distortion. Includes: Self-adhering hook and loop pad, coarse, medium and fine abrasives, Pro Glass Polishing Kit (40011) and instructions.