New Kalloy Bicycle Seat Post Clamp Binder With Quick Release Anodized Black - Brand new never installed - Made of aluminum alloy - 2D forged clamp w/quick release - Diameter: 28.6/31.8/34.9mm - Height: 15mm - Weight: 50 g - Fits most bikes w/seat post tubing OD 28.6/31.8/34.9mm - Please note the number on the seat clamp does not represent the size, it's for manufacturer use only - Feel free to contact us if you have any questions - Thanks for looking