22mm 28mm Motorcycle Handlebar Riser Mount Adapter Kit Extender Riding "so that the rider has a more comfortable riding posture, effectively reduce the fatigue of long-distance riding. Good control and stability at high speeds Ensure safety while driving." Just slide the stem extender onto the steerer tube and tighten it, very easy to fit. The handlebar height adapter is made of refined aluminum alloy, high toughness, no deformation, corrosion resistance, sturdy and durable.