Description: Made of aluminium alloy CNC, good finish and solid, lightweight and durable. Mounts to 30.9mm to 33.9mm seat post or handlebars via hinged mounting bracket. Bracket turns 90 degrees to suit mounting position. Compatible with all water bottle holders on the market With this mount, you can flexible move your cycling bottle to any position Specification: Material: aluminium alloy CNC Length: approx. 7.8cm/3inch Suit for diameter 30.9-33.9mm/1.2-1.3inch bike seatpost or handlebar Package Includes: 1 Set Bike Bottle Holder Mount