quick release seatpost clamp is strong and light. It's great for any style of bike in need of securing a seat post.The bike seatpost clamp should match the diameter of the seat tube on your frame and not the diameter of the seatpost itself. 34.9mm/1.374 inch seat post clamp is generally suitable for 30.4mm-31.6mm(1.196 inch-1.24 inch) seat post.The seatpost quick clamp includes spherical washer and mates with a cylindrical anchor barrel. This means that threads are always perfectly aligned, preventing binding and ensuring consistent clamping force.This mountain bike seatpost clamp fits on:mountain bike,folding bike,track bike,fixedgear,road bike and so on.Lightweight aluminum Alloy, titanium alloy bolt with integrated washer with this bicycle seatpost clamp.Aluminium alloy material, good quality, firm and durable, long service life.Adjustable and Compatible With seatpost clamp bolt: For holding the seat lever to the position. There is no need for any tools allow for your convenience on the road seat height adjustment. Convenient design, easy to install, no complicate procedure needed.Material:Aluminum alloy + titanium alloy screwscolour:RedPackage Contents:1 * Bike Seatpost ClampOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.