Note: Please measure the actual required diameter before purchasing. package is not include the saddle clamp, thank you. Package Include: 1 piece bike seat post, saddle clamp is not include. color is black. Size: The bicycle seat post length is about 350mm/ 13.8 inch, diameter is about 25.4mm/ 1 inch, and the thickness of the tube is about 2mm/ 0.08 inch. Material: The bicycle seat tube saddle pole is made of aluminum alloy, durable and stronger inside design will improve the load-bearing of seat post. Widely Use: The bicycle seatpost is used for most old style bike, and the bike saddle with clamp. saddle pole bike seatpost seat tube is suitable for for mountain road bike fixed gear bike seatpost.