Features: brand new and high quality The for seat tube clamp is finely processed, and the screw is a fine-tuning design, so that the for seat tube clamp will not damage the for seat tube itself while locking the for seat tube. Let the frame and the seatpost fit more closely, and the force is more direct! Made of high-strength aluminum alloy, it is lightweight and durable ,the weight is only 30.5g. The size of the for seat tube clamp is 41mm, which is for most folding bicycles with a for seat tube diameter of 33.9mm (suitable for aluminum frame, not suitable for steel frame) Contact us without heisitation if you have questions,we will try to serve for you until you are satisfied. Specifications: Material: Aluminum Alloy Size: 4.1cm/1.61in Color:Colorful Black Gold Red Silver Note: Please allow 0-1cm error due to manual measurement. Make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Bike for Seat Tube Clamp.