The metal surface is anodized, which is strong and durable, beautiful and fashionable, and effectively increases corrosion resistance, insulation, heat resistance, etc. Convenient assembly, two installation methods, convenient installation, suitable for a of bottle cages. Wide application range, free adjustment, suitable for 30.9mm/31.6mm seat tube and 31.8mm swallow handle, straight handle. and convenient-weighs only 2.1 ounces and can be rotated 360 degrees, allowing you to adjust the bottle holder according to your needs. Bicycle cup holder, very suitable for cups, cans and water bottles, suitable for most standard size water bottles. Name: Bottle cage conversion seat Application: all kinds of conventional handlebars Colour: black Material: aluminum alloy Size: 8x3.5cm Package Contents: 2 * bottle cage conversion seat Only 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.