This is a re-engineered clamp with an optimized center-loaded bolt design that equalizes load distribution, making position adjustments super easy. With this clamp set you'll be able to clamp metal 7x7mm saddle rails and Specialized FACT carbon 7x9mm saddle rails. This is a 7x7mm and 7x9mm replacement clamp set for all Specialized road seatposts equipped with a single-bolt cylindrical wedge clamp design. The new design clamp provides better clamping and prevents saddle slipping.