【Material】: The bike bottle cage adapter is made of high-quality aluminum alloy.The bike water bottle holder Mount have Low density, high strength, good corrosion resistance and light weight. The smooth surface ensures the security of your bike and can withstand harsh weather conditions. 【Size】: This bike Bottle Cage Adapter Fits for diameter is 0.74 - 1.30 In (19-33 mm) seat post or handlebars，It is suitable for installing a bottle cage with a hole diameter of 2.56 in (6.5 mm),The bottle cage adjustable adapter can be installed horizontally or vertically on the handlebar and seat post of the bike according to your needs. 【Easy to install】: All you need is a hexagon wrench (already included in the package) to install it, attach the bike bottle cage adapter to your handlebars, adjust the seatpost to any position you like, tighten the screws, and the bike bottle cage adapter is very easy to adjust. 【Wide compatibility】: The bike water bottle rack adjuster is designed with double screws, which is suitable for most bike, motorcycles and electric vehicles. The bike bottle cage adapter is compatible with most handlebars, seatposts, and it is compatible with most bottle holders as well. 【Packing】: The package includes one piece of bike bottle cage adjuster, one thick protective spacer, one thin protective spacer, and a 3 mm Allen socket screw