[CNC Machined 31.8mm Clamp]: Lightweight howllow out design, weight 39.5g, diameter 31.8mm, CNC Machined aluminum alloy quick release seat post clamp, lightweight and [Quick Release Seatpost Clamp]: is smooth and easy to install and use. Quick release lock design, you can adjust the clamp on the way even without any other tools. [Extended Lever]: Ergonomic design, extended lever, more efficient and comfortable seatpost clamp. Seat clamp with extra long quick release lever for added clamping force. [Anti-oxidation Aluminum Alloy]: Aluminum alloy, anti-oxidation, the finish is anodized and has somewhat of a matte appearance, [Wide Usage]: Suitable for road bike, mountain bike, folding bike, track bike, ect. Please double measure your outer seat post diameter to get the right size., Manufacturer: VGEBY