High-Quality Material: The bike fork stem extender is made of aluminum alloy, featuring a detachable design that offers improved performance compared to traditional height boosters. Maximum Height Extension: The bike stem riser allows adjustment of height by adding or removing washers. The adjustable height range is 3-55mm, helping to achieve a comfortable riding position without excessive forward bending. Easy Installation: Simply install into the front fork stem with an outer diameter of 28.6mm. The design provides a hidden height increase with no visible marks, contributing to a more comfortable cycling experience. Wide Application: Designed for fork tubes with an inner diameter of 24.6-25.4mm. Adjusting handlebar height can improve control on steep terrain. Compatible with most standard fork setups and suitable for various bicycles including mountain bikes and road bikes. Product Color: Black Inner Diameter: 24.6mm-25.4mm (31/32 in - 1 in) Outer Diameter: 28.6mm (1-1/8 in) Height Adjustment Range: 3mm-55mm (0.1-2.2 in) Color: Black Material: Aluminum alloy Package Includes: 1 x Bicycle Handlebar Booster Note: Light reflection and differences in display screens may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3cm.