This shim washer is used for the 1:1 LJ BevelBox. It positions the 1/2 in. hex bore miter gear (am-3772) on the output shaft to mesh properly with the 8 mm keyed miter gear (am-3776) from a CIM motor or a 1/2 in. hex bore miter gear (am-3772) on a 57 Sport or CIM Sport planetary gearbox. Specifications: