Easy to install just with a wrench, when you finish mounting, the stem riser is invisible outside.Constructed of high-strength aluminum alloy, anti-corrosion and non-deformation. Ensures a long time service.Suitable for mountain bicycle to rise up the handlebar fork stem.Can extend the fork stem by 3mm to 50mm.Great accessory for cycling enthusiasts, adjust the height of stem by yourself with it.Condition: 100% Brand New and High QualityMaterial: Aluminum AlloyColor: BlackLength: Approx. 12.2cm / 4.8inchAdjustable Height: Approx. 3-50mm / 0.1-1.9inchSuitable Inner Diameter: Approx. 24.6-25.4mm / 0.9-1inchWeight: Approx. 176g/pcsPackage included:2 * Bicycle Fork Stem ExtenderOnly the above package content, other products are not included.Note: Light 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.