Quick and easy-to-change Diamond Rings are ideal for polishing small rooms or finishing edges. They can be fitted to the Hum-B Variable-speed upright grinder or to any standard 7-inch angle grinder and are available in 12 grits. Four are designed to prep the floor and remove gouges and scratch marks left behind by cup wheels in the initial prep work. The remaining eight are for polishing floors to a high gloss. CDCLarue Industries Inc. 866-954-9700. www.cdclarue.com