Complete kit includes three different-size plastic rings and locking clamp. Compresses piston rings from a range of 40mm to 60mm diameter. Fits 632-300 Cylinder Assembly, 632-450 Cylinder Assembly, 632-502 Cylinder Assembly, 632-530 Cylinder Assembly, 632-542 Cylinder Assembly, Fits 632-549 Cylinder Assembly, 632-560 Cylinder Assembly, 632-568 Cylinder Assembly, 632-574 Cylinder Assembly, 632-580 Cylinder Assembly, Fits 632-809 Cylinder Assembly, 632-830 Cylinder Assembly, 632-836 Cylinder Assembly, 632-845 Cylinder Assembly, 632-860 Cylinder Assembly, 632-872 Cylinder Assembly, 632-877 Cylinder Assembly.