Zipp Service Course seatpost features an innovative low-profile clamp allowing greater for-aft adjustment.It's a post thats lightweight and strong for security and a precise fit at an affordable price. Dual bolt, low profile micro adjust cradle 3D forged from a single piece of AL-7050 Stainless steel hardware Minimum insertion length is 90mm Offset (mm): 0 Color: Silver Clamp Style: Standard Rails Material: Aluminum Length: 350 Diameter: 27.2 Defined Color: Silver