Gator 5" Stick-On Sanding Discs Kit is used for a variety of sanding tasks. The kit includes a universal pad for both stick-on and screw-on discs, a flexible pad for flat or contoured surfaces, and a 1/4" arbor. The discs are made of zirconium oxide and are suitable for use on fiberglass, metal, and wood. They have a speed rating of 3000 rpm. This kit makes it easy to turn your electric drill into a powerful sanding and finishing machine.