These adjusters will replace your stock fork caps and allow you to fine tune your front suspension, with almost an inch of preload adjustment Easily dial in your front-end preload without having to remove the stock caps and cutting spacers, with a turn of the adjuster, up or down CNC machined out of 6061 aluminum Comes with O-rings and ready to install Made in the U.S.A.. ADJUSTERS FORK 39MM RAW