The Cornwell Mini Die Grinder Set includes the Cat535 and Cat535R models in a sleek blue color. This single item set features a 1/4 inch collet size and air inlet size, with a maximum speed of 18000 RPM. The variable speed trigger on this air grinder allows for precise control during use, making it an essential tool for automotive and industrial applications. The set also includes an air hose fitting for added convenience.