Feature: 1. Made of aluminum alloy, it has smooth surface, corrosion resistance, high strength, sturdiness and durability. 2. Can be rotated 90 degrees to fit the installation position, and can be installed horizontally or vertically on the handlebar and seat post of the bicycle according to your needs. 3. Easy to install and remove. Just clamp the bottle cage adapter to the corresponding tube, match the protective gasket, and install it with a hex wrench. 4. Suitable for handlebars with a diameter of 21‑31.8mm/0.8‑1.3in, suitable for bicycles, mountain bikes, road bikes and all bicycles and electric scooters. 5. Secure and sturdy system. This water bottle holder adapter can ensure bottles staying firmly in place when riding. Specification: Item Type: Single Bottle Cage Mount Adapter Material: Aluminium Alloy Product Color: As Pictures Shown Product Size: Approx. 78x73mm / 3.1x2.9in Product Weight: Approx. 72g / 2.5ozApplicable: For 21-31.8mm / 0.8-1.3in pipe diameterRotable: 90 degree rotation . Package List: 1 x Single Bottle Cage Mount Adapter1 x Gasket1 x Hex Wrench