Description: Practical drink holder with mounting bracke Adjust the size by rotating the fixed screw with hand only or a hexagon screw too Easy to install, design with a mount,compatible with handlebar/crossbar/front fork diameter:0.6"-1.6"(1.5cm-4.2cm) Keep your drink handy and securely in place during riding Durable, convenient and light weight design Suitable for varied types of bikes,including mountain bike and folding bike Specification: Holder Diameter: 2.6" - 3.5" (6.5cm-9cm) Mount Diameter: 0.6"-1.6" (1.5cm-4.2cm) Weight of water holder: 58g Weight of Mount: 95g Holder Diameter: Package Includes: 1 x Aluminum Alloy Bike Water Bottle Holder 1 x Aluminum Water Bottle Holder Mount Note: To ensure correct purchase, please check your bottle/cup size before purchase