Keystone Abrasives is a U.S. manufacturer of coated abrasive products, custom-making sanding belts, discs, rolls and pump sleeves with specialized equipment. Unlike a conventional sandpaper supplier, the company manufactures to customer requirements while also supplying specialty abrasives from other manufacturers. Its custom sanding discs can range from 1/2 inch to 42 inches in diameter, and its abrasive rolls can be made up to 54 inches wide.