CDCLarue's Diamond Rings are ideal for polishing small rooms or finishing edges. They can be fitted to the Hum-B Variable speed upright grinder or on any standard 7-in. angle grinder and come available in 12 grits - four of which are designed to prep floors and remove gauges and scratch marks and the other eight for polishing floors to a high gloss. To change the rings just place it onto the cup wheel outfitted with a high strength Velcro pad. Diamond Rings can polish up to 9,000 sq. ft. of surface area when used properly.