This is a re-engineered clamp with an optimized center-loaded bolt design. That #39;s fancy talk for it equalizing load distribution, so making position adjustments is now super easy. And with this clamp set you #39;ll be able to clamp metal 7x7mm saddle rails and Specialized FACT carbon 7x9mm saddle rails. 7x7mm and 7x9mm replacement clamp set for all Specialized road seatposts equipped with a single-bolt cylindrical wedge clamp design. New design clamp for better clamping and non-slipping of the saddle. Compatible with: Shiv Carbon Post, S-Works Carbon Post, CG-R Carbon Post, S-Works SL Pave Carbon Post, Command Post XCP, Venge Carbon Post Bolt Included.