The United Abrasives/SAIT Saitech™ cutting wheels (Type 1/Type 41) are made to go on an angle grinder or a circular saw. It is a high performance wheel with a ceramic aluminum oxide grain, designed to outlast standard aluminum oxide wheels. Uniform, high density grain structure is extremely durable and self sharpening. United Abrasives/SAIT wheels are externally reinforced with fiberglass layers to provide ultimate safety in a thin wheel. Proudly manufactured in the USA.