1. High-Quality Material: The bike fork stem extender is made of aluminum alloy material, detachable and design, which is greatly improved compared to traditional height boosters. 2. Maximum Height Extension: The bike stem riser increase or decrease the washer to adjust the height. The height range is 3-55mm. Bring you enjoyable and relaxed cycling experience without bending the body too low. 3. Easy Installation: Just connect up the front fork stem,outer diameter: 28.6mm, hidden height increase, no height increase marks, bringing you enjoyable and relaxed cycling experience. 4. Wide Application: The bike raiser is designed for 24.6-25.4mm inner diameter of the fork tube. Adjust the height of your handlebar properly makes it easier to hold traction on the steep hill. Suitable for most standard fork installations, universal for bikes, mountain bikes, road bikes, etc. Product Color: black silver Applicable Inner Diameter: The inner diameter of the front fork head tube is 24.6mm-25.4mm (31/32 in - 1 in) Product Outer Diameter: 28.6mm (1-1/8 in) Height Increase Range: about 3mm- 55mm/0.1-2.2in Colour:Black Material:Aluminum alloy Package Contents: 1 x Bicycle Handlebar Booster Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.