The United Abrasives/SAIT Type 27 Saitech Ultimate Performance™ wheels are made to go on an angle grinder. High performance, ceramic aluminum oxide grain, is designed to outlast standard aluminum oxide wheels. Hard bond for long life grinding with fast stock removal. Very uniform, high density grain structure for long life and cooler cut. United Abrasives/SAIT wheels are reinforced with the highest quality fiberglass for maximum safety and performance. Proudly manufactured in the USA.