The Biondo Double O button is the latest in design technology by the Biondo Racing family. It features a great looking anodized black rim and 7/8" diameter dark red mushroom style top. The included bracket allows for easy mounting into any door car or dragster steering wheel with a 1/2" hole. It's quick, extremely comfortable and consistent. It is designed for bracket racers and is SS/Comp legal. Two shims are also included for easy installation. These shims are used to fill space between the actuator, and the bracket.