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 : Max Height: 260mm Offset: 20mm Color: Bead Blast Black Clamp Style: Standard Rails Material: Aluminum Min Height: 85mm Length: 350mm Diameter: 27.2mm Weight: 245g