These handy spin Bolts are perfect building a new body on your race car. Use these with the Spin Lock Nuts I offer to install all of you body bracing. The Serrations allow you to not have to use a lock washer and still keep your bolt tight. Bolts have 1/4"-20 threads and a built-in captured washer. Bolts are commonly used to fasten body panels and side skirts for easy removal, used anywhere a bolt with a captured washer is needed