With the addition of the Kuryakyn 6299 premium ISO contoured Throttle Boss grip accessory, it can make the difference between a quick trip and a cross-country adventure. The small, adjustable paddle positioned under the palm of the throttle hand allows user to slightly relax grip on gas while maintaining a constant speed. Provides a larger surface area and pad for even more comfort than the original design; Eases hand and forearm fatigue. Simple to install and easily adjustable to suit your needs. Includes (1) contoured ISO Throttle Boss and (4) 4-40 x 9/16" socket head cap screws; suggested tools for installation (not included) are a set of hex wrenches. The Kuryakyn 6229 premium ISO contoured Throttle Boss grip accessory is right side compatible with all Kuryakyn ISO grips, ISO flame grips, and transformer grips (Honda GoldWing will not accept Throttle Boss).