U.S. and Metric Master Cylinder Plug Kit, Part No. 803P, enables the technician to isolate the Master Cylinder from other brake components. It tests whether the internal seals are leaking or in good condition. Includes 29 machined aluminum plugs to fit most domestic and import vehicles. SAE sizes include: (2) 3/8-24, (2) 7/16-24, (2) 9/16-18, (2) 9/16-20, and (2) 1/2-20. Metric Adapters: (4) M10x1.0, (4) M10x1.25, (2) M11x1.5, (2)M12x1.0, (2) M12x1.5, (2) M13x1.5, (2) M14x1.5, (1) M14x1 and (1) M10x1.50.