Patented design pivoting risers are incredibly universal with a two-piece design that allows them to be clamped to any machine with 7/8" handlebar clamps, Allow you to clamp a stock 7/8" diameter handlebar, or you can remove the 7/8" reducers and clamp a 1-1/8" aluminum handlebar; reducers lock into risers to ensure no slippage between components, and serrated teeth provide maximum gripping power on the handlebar, Risers are held by the original 7/8" clamps and reclamp the handlebars 2", 3-1/2" or 5" higher (depending on size purchased) with pivoting fore and aft adjustment, Rox out-board positioning also makes them incredibly durable, Made in the U.S.A.