The innovative Throttle Assist allows you to relax your grip on the throttle making "pins and needles" and fatigue a distant memory. Simple design emphasizes reliable function over flashy complex styling. Variety of interchangeable rubber inserts allow use with most grip configurations. Fits all O.E.M. grips and aftermarket grips with minimum 1-1/8" to maximum 1-3/4" outside diameter. Fits all Kuryakyn grips. Note: NOT for use with 1-1/4" bars. Note: Kuryakyn part number: 6218.