Norton SandDollars Surface Prep Pads come in four grit sizes-coarse (blue), medium (red), fine (yellow), and very fine (green). These foam-backed pads allow you to abrade surfaces of flooring without getting too deep into the finish, so they're perfect for sanding between coats. The result? A smooth floor with no risk of swirl marks in the finish. Choose from 16 inch and 20 inch diameter options. 16 inch Norton Sand Dollar Pad can be used with rotary floor buffers that run a 16 inch block, like the Clarke RS-16 and RS-16 DC, Bona FlexiSand DCS and FlexiSand 1.5, and the Clarke Sander 16. The 20 inch pads are compatible with rotary floor buffers running a 20 inch block, such as the Clarke FM-2000 and Pioneer Eclipse Floor Care Machine.