Box Two Quick Release Seat Clamps are cold forged and CNC machined from 6061-T6 aluminium alloy. The head of the quick release lever and the face of the clamp are given a proprietary low-friction surface treatment that ensures smooth lever action for the life of the clamp, without the need for a bushing. Meets or exceeds ENM standards. ###section### Product Specs SIZE: 31.8mm WEIGHT: 0.06lbs (27g) Colour: Black, Blue, Red; Size: 31.8mm