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: and High Quality Material: Aluminum Alloy Color: Black Length: Approx. 12.2cm / 4.8inch Adjustable Height: Approx. 3-50mm / 0.1-1.9inch Suitable Inner Diameter: Approx. 24.6-25.4mm / 0.9-1inch Weight: Approx. 176g Package Included: 1 * Bicycle Fork Stem Extender Only the above package content, other products are not included. Note: Light shooting 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. Note: The product may have a slight tolerance of 1-3 mm/1-3 g in size/weight, and the image color may differ from the actual item due to lighting.