Zipp Service Course seatpost features an innovative low-profile clamp allowing greater for-aft adjustment. It's a post that s 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 90mm SPECS: Clamp Style Standard Rails Color Bead Blast Black Diameter 31.6 Length 350 Material Aluminum Max Height 260 Min Height 35 Offset (mm) 0 Weight 245g