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 is for 4-1/8 inch bore engines with stock 1999-Up Harley-Davidson big twin bolt pattern. Kit includes: Base end torque plate Head end torque plate Stop arm Torque bolts Vise tab Tab bolt S&S Part #: 53-0054