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. Dual bolt, low profile micro adjust cradle. 3D forged from a single piece of AL-7050. Stainless steel hardware. Minimum insertion length is 90mm. Item 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,