2x 28MM 1 1/8" Handlebar Riser Mount Clamps Motorcycle Dirt Bike ATV "Compared to other motorcycle handlebar risers on the market, it is more durable, less prone to wear, rust and, and has a longer service life. riser allows more adjustment of the handlebar tilt to further improve the sitting posture." 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.