Available for 5-inch random orbit sanders, the sandpaper comes in three abrasives: coarse, medium, fine. The company has adapted its stainless-steel shaping and smoothing technology to a modern random-orbit sander. The new 5-inch diameter metal discs have burred perforations that cut the wood and the discs come in three coarseness grades. Microplane claims that one disc will do the work of 35 sheets of sandpaper.