Zipp Service Course seatpost features an innovative low-profile clamp allowing greater for-aft adjustment.It's a post that lightweight and strong for security and a precise fit at an affordable price.Features-Dual bolt, low profile micro adjust cradle-3D forged from a single piece of AL-7050-Stainless steel hardware-Minimum insertion length is 90mmItem Specifications-Defined Color:Black-Weight:245-Offset (mm):20-Diameter:31.6-Max Height:260-Color:Bead Blast Black-Min Height:85-Material:Aluminum-Clamp Style:Standard Rails-Length:350