2pcs 1 1/8" 28mm CNC Motorcycle Handlebar Mount Riser Clamp Machined Left Right HandleBar "Comfort and Safety This bar riser adjusts the motorcycle handlebar to an appropriate height, so you will get a comfortable driving posture. provides a more comfortable riding experience and is easier to adjust the angle" 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.