This sandpaper driver utilizes a 3/8" thick foam pad for gripping sandpaper. Most sandpaper will have a sticky backing that will attach to this foam pad, not allowing it to move once attached. Make sure all pieces of sandpaper are correctly centered on the driver. A durable aluminum casting helps to make sure that all sand paper is centered. This heavy duty sandpaper driver is constructed from marine grade plywood and fits onto most standard 17" floor buffers.