1" 25mm Motorcycle Handlebar Bar Risers Up Bracket Handle Bars Mount Clamp "Function: This Motorcycle Handlebar Riser Mount can help you keep a more comfortable riding posture, effectively alleviate the fatigue of long-distance riding. riser can raise the handlebar to provide a more upright riding 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.