Hope Quick ReleaseFeaturing a universal design that allows the switch from a bolt to QR style clamp, the Hope Seat Clamp is designed to keep your seat post in one spot and look good doing it. CNC machined aluminum lever and clamp Brass cam allows increased durability clamping force Laser etched logos HOPE 34. 9mm QR Seatclamp Blue Material: Aluminum Color: Blue Type: Quick Release Diameter: 34. 9 Defined Color: Blue Weight: 30 HOPE 31. 8mm QR Seatclamp Blue Material: