Throttle Boss allows you to customize your motorcycle with a stylish and comfortable accessory | Designed with a 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 for even more comfort; Eases hand and forearm fatigue | Includes (1) Zombie Throttle Boss and (4) 4-40 x 9/16" (SHCS) socket head cap screws; Suggested tools for installation (not included): set of hex wrenches | Throttle side compatible with the Kuryakyn Zombie handlebar grip