Bike Seat Post Alumium Alloy Adjustable 25.4/27.2 x 400mmSPECIFICATION: Name Bike Seat Post Color Black Material Aluminum alloy Length 400mm(15. 7inch) Thickness 2. 5mm0. 1inch Seat Post Diameter 25. 4 27. 2mm1 1. 07inch Package Include: Bike Seat post x 1 Precision scale The scale of the seat post is precise and clear,and it is easy to adjust to the height that suits you. Micro adjust Micro adjustable clamp You can adjust the tilt angle of the saddle via the clamp to make the saddle achieve the best riding