Specification:Material: aluminum alloyColor: 5 options​Size: 78*55*31mmApplication: 19-33mm pipe diameterFeatures:It is made of high-strength aluminum alloy with high finish, firmness, lightness and durability.The bracket can be rotated 360 degrees, which is convenient for you to find the correct installation position.The bottle holder is firm and durable, and can be installed on the seat post.When you are riding a bicycle, this bottle cage allows you to get your water bottle quickly and easily.There are three ways to use it, which can be used according to your own situation.Package includes:Bottle cage conversion seat*1Note:1. Manual measurement, the size will have an error of 0.5-2mm, please refer to the actual size​​.2. Due to the difference in light and screen, the color of the product may be slightly different from the picture.