Replace your worn out, leaky, crusty, 35 year old master cylinder with this brand new black aluminum unit. Bolts right onto 7/8" handlebars commonly found on metric motorcycles such as Yamaha, Honda, Kawasaki, Suzuki and Triumph to name a few. Features M10 x 1.25mm banjo bolt and sealing washers. 14mm piston diameter. Integrated mirror hole is size M10x1.25mm right hand threaded (clockwise threads). Also includes integrated brake light switch. For use with DOT3 or DOT4 brake fluid only.