The Syncros FL1.5 Aluminum Zero seatpost features the same Syncros-designed head that made their seatposts so desirable many years ago. The clamp consists of an upper and lower clamp that is held to the post with two screws. The screws lace through holes that are machined into the head of the shaft, then through the clamps and thread into bolts that rest in the upper clamp plate. Simple and easy to use. Cosmetics are classic black on black Syncros and will match virtually ant frameset. Diameter is the becoming-industry-standard 31.6mm or 27.2mm and the longish 400mm length fits just about any frame, large or small.