The Ritchey Comp Zero Carbon post offers no-slip saddle engagement and high adjustability by securing the rails with fore and aft bolts. Whether you're hitting rough singletrack or remounting in a hurry this ensures the saddle stays exactly where you want it.Carbon fiber construction with UD carbon finish6061 alloy clamp with 2-bolt fore/aft adjustment Length 400 Color Black Diameter 27.2 Material Carbon Defined Color Black Clamp Style Standard Rails Offset (mm) 0