2x 28MM 1 1/8" Handlebar Riser Mount Clamps Motorcycle Dirt Bike ATV "Compared to other motorcycle handlebar risers on the market, it is more durable, less prone to wear, rust and, and has a longer service life. riser allows more adjustment of the handlebar tilt to further improve the sitting posture." Motorbike Handlebar Risers is A safe and reliable way to fit a narrower bar to a wider stem. Simply place one shim each side of clamp area on handlebar and insert into stem, tighten as normal.