ADJUSTABLE HEIGHT: The bicycle fork stem extender is equipped with 5x10mm joints, provides stem height increase up to 50-100mm. You can adjust the joints to fit your own height. High-quality materials: The bicycle handlebar riser is made of high-strength aluminum alloy, and the workmanship is strict and exquisite. The matte process makes the surface more textured. Suitable for Most Bikes: The bike handlebar extension is compatible with most bikes with 1-1/8'' (28.6mm) threadless without steerer tube like road bike, mountain bike, mountain biking, , etc. Easy to install: loosen the handle with a hex key, insert the rod riser and tighten the screw to finish. Even cycling beginners can easily use. Comfortable Cycling: The bicycle head-up adapter is more flexible, lightweight, much easier to strain when climbing. The operation is comfortable and convenient. Make your ride more comfortable.