CHROMAG Seat QR 35mm"Our QR seatpost clamp features a unique bushing that contacts the entire cam surface for the smoothest, most powerful action possible. The combination of a precision brass bushing and the smooth cam action of the lever makes for the most enjoyable lever experience. The brass bushing is precision machined to press fit perfectly into the collar and mate with the lever cam. A custom Chromag 6mm bolt ensures reliability. CNC machined in Canada. (All