GP28002 Glass Scratch Repair DIY kit, GP-WIZ System, Scratches, Water Damage, Surface Marks / For any Type of Glass / Discs Diameter 2 inch DIY Version of Professional GP-WIZ System, used and approved by GLASS POLISH LTD. Designed to be used with a standard mains powered electric drill (at recommended speed 1500-2200RPM) Removes scratches, scuffs, hard water deposits. Designed to remove single scratches up to 10 inches in length Can be used on any type of glass surface including toughened glass and any automotive glass.