M12 Flat Washer - 29mm Outer Diameter M12 Washers used with the M12 nut to hold the clutch assembly to the output shaft in 150cc and 125cc GY6 4-stroke QMI152/157 QMJ152/157 engines and 150cc GY6B 4-stroke ZNEN engines. May also be used in other applications. Set of 2Inner Diameter: 12.4mmOuter Diameter: 29mmThickness: 2mm