Box One Quick Release Seat Clamps are cold forged and CNC machined from 6061-T6 aluminum alloy. A quick release lever makes adjusting your seat height quick and easy. The head of the quick-release lever and the face of the clamp are given a proprietary zero friction surface treatment that ensures smooth lever action for the life of the clamp without the need for a bushing. ###section### Product Specs SIZE: 31.8mm WEIGHT: 0.06lbs (28g) Colour: Silver, Blue, Black, Red; Size: 31.8mm