Features: Made of reinforced engineering plastics, sturdy and wear-resistant, it ensures long lasting use. By rotating the bottom knob, the size can be freely adjusted to accommodate water bottles ranging 5.6-7.8cm/2.17-3.07inch. Suitable for installation on various motorcycles, electric vehicles, and bicycles with round poles. The base can rotate 360degrees by loosening the screws. Suitable for installation of horizontal and vertical tube. Designed for outdoor cycling enthusiasts, this bracket is a must have for cyclist of all kinds. Specifications: Material: Plastic/Resin Style: Mirror Base Style/Bike Handle Style/Hanging Style Mirror Base Style: Suitable For Rearview Mirror Holes Of 1cm/0.39inch Bike Handle Style: Suitable For Pipe Diameters Of 2.1-2.8cm/0.79-1.10inch Hanging Style: Suitable For Pipe Diameters Of 1.5-3.3cm/0.59-1.30inch Suitable Bottle Diameter: 5.6-7.8cm/2.17-3.07inch Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Water Bottle Bracket