The 3" Pistol Surface Prep Set is ideal for surface preparation prior to sanding. Cleans areas of harder dirt and rust before fine sanding takes place. This 3" Pistol Surface Prep Set could also be used for alloy wheel refurbishment and general cleaning/sanding in the smart repair/bodyshop industry. Kit Contentsx1 Pistol Surface Prep Tool x1 3" female screw lock backing pad x1 3" 60 grit male screw lock sandpaper x1 3" 80 grit male screw lock sandpaper x1 3" 120 grit male screw lock sandpaper x1 3" fine screw lock conditioning pad x1 3" medium screw lock conditioning pad x1 3" coarse screw lock conditioning pad x1 Hex Wrench 16,000RPM for efficient sanding/cleaning Safety speed regulator locks in motion to prevent accidental speed change during use Efficient .