1. Suitable for 28.6 mm bicycle handlebar riser: the size of the bicycle stem the washer height is 5 mm, 10 mm and 20 mm and the threaded rod length is 115 mm/150 mm/180 mm/210 mm. It is suitable for most bicycles such as city bikes, road bikes, mountain bikes and electric bicycles. It is recommended to measure the diameter of the bicycle handlebar carefully before purchasing. 2. Highstrength aluminium alloy material: the bicycle handlebar raiser is made of aluminium alloy, which has a high strength and low weight. It is stronger and does not deform than other materials. As it also has excellent corrosion resistance, it will not rust even if it gets wet in the rain. This means that it has a longer life and can be used for a long time, giving you a highquality driving experience. 3. Choose the desired height and drive y: the MTB stem is equipped with washers in different quantities and sizes. You can increase or decrease the number of washers depending on the desired height. It can improve your driving posture, reduce waist, neck and arm pain, back inability to straighten up, and other problems caused by incorrect riding posture. 4. Double screw fixed, not easy to loosen: the bicycle handlebar jack is reinforced with a double screw structure to prevent loosening and slipping while driving. Equipped with a springloaded handlebar cover, which is dustproof, waterproof and durable after locking. Bicycle stem adapter. Adjust the handlebar height correctly to make it easier for you to maintain traction on steep hills, and provide you with a comfortable and relaxed driving experience.