Features: Make of aluminum alloy, high strength, light weight, Can used for long terms. Raises the height of your handlebars by increasing the height of your stem. Easily installation, converts a thread quills stem setups to threadless. Handling flexible, light weight, much easily to force when climbing. Suitable for Fork Mountain Bike, Road bike, Track bike, Fold bike and so on. Specifications: Materials: Aluminum alloy Color: Black/Silver Lower section diameter: about 22.2mm (0.87inch)/25.4mm (1in) Upper section diameter: about 28.6mm/1.13inch Total length: about 160mm/6.30inch Package Includes: 1pc Bicycles Stem Risers Adapter note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.