The S&S cylinder torque plate kits are used to simulate operating stress conditions when boring and honing aluminum cylinders. These plates are machined from heat treated chrome moly steel and precision ground on the working surfaces. This kit for 4-1/8 inch bore engines with S&S 4-1/8 inch bolt pattern. Kit includes: Base end torque plate Head end torque plate Stop arm Torque bolts Vise tab Tab bolt S&S Part #: 53-0051