These Splined Adapters have teeth that match the footpegs or floorboards and allows the angle of the footrest to be set and locked in place. This convenient 2-Part system also allows you to change your footrests without purchasing new splined adapters. Be sure to check for your specific application on the Chart Image Picture. WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov This warning is being provided to comply with the State of California's Proposition 65.