Motorcycle 22mm 28mm Handlebar Clamp Handlebar Risers Bar Clamps "Reduces upper body strain during extended rides through optimized handlebar positioning & grip alignment allows you to have a more comfortable riding experience can easily increase the handlebar height" 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.