Our most popular 1/4? grinding wheel the United Abrasives A24R is great for long lasting general purpose grinding The A24R is composed of a special aluminum oxide grain which assures consistent stock removal for tough applications United Abrasives/SAIT wheels are externally reinforced with fiberglass layers to provide ultimate safety Proudly manufactured in the USA Amazon.com United Abrasives, Inc./SAIT is a privately held company that was established in 1970. Our relationship with SAIT, an Italian corporation founded in 1953, began as we first manufactured coated abrasive belts. By 1975 we had expanded our production to include bonded abrasives. The strong commitment between United Abrasives, Inc. and SAIT continues today. We are well-known worldwide for quality, consistency, and the highest levels of service. We are one of the largest and leading manufacturers of abrasive products in the world. We only use premium materials. We demand consistent manufacturing operations and have the most rigorous quality control testing in the industry. United Abrasives manufactures a full line of bonded abrasives: grinding wheels, cutting wheels, cup wheels, cones, plugs and a host of similar bonded products. We also manufacture a wide variety of sanding sheets, belts, rolls, flap discs, fiber and PSA discs. Plus, we offer a broad line of wire brushes, non-woven abrasives, precision diamond-cut Tungsten Carbide Burs, diamond wheels, and a full line of accessories. SAIT#20090, Type 27, 9 x 1/4 x 7/8, 6,600 Max RPM, Grade A24R, Long Life Depressed Center Wheels See more