This sanding pad will turn your electric drill into a powerful sanding and finishing machine. It will help to make your next project quick and easy. What's Included: Contains 1 Back-Up Pad, 3 discs (Fine, Medium, Coarse) Flexible pad for flat or contoured surfaces. The 1/4 In arbor is designed to fit any electric drill for use with bolt-on or stick-on sanding discs.