Ritchey WCS Alloy 1-Bolt Seatpost Complete Clampset Description: Ritchey 1-Bolt Seatpost Clamps alter the clamp diameter of WCS alloy seatposts to accommodate rail dimensions of different sizes. Note: WCS alloy clamps work on Wilier Cento series frames Features: Optional 1-Bolt saddle rail clamps to replace stock clamps on Superlogic/WCS Carbon or WCS Alloy 1-Bolt seatposts with 7x9.6mm (Fizik carbon rail) or 8x8.5mm (most other carbon rail) clamps. Stock clamps fit standard 7x7mm rails Stamped code: DC for carbon/9.6, VF for carbon/8.5, F for alloy/9.6, S for alloy/8.5 Silver alloy clamps fit carbon seatposts, black alloy clamps fit alloy seatposts Specifications: Color: Black Diameter: 38.35mm Length: 70mm Setback: 8mm