Ritchey WCS 1 Bolt SeatpostThe WCS 1 Bolt Seatpost features Ritchey's unique "Sidebinder" single bolt clamp design, which provides quick and secure engagement. Also, its wide saddle clamp plate reduces stress on lightweight hollow saddle rails. This model also features 20mm of offset to help you obtain that aero race position.Features: Material: 3D forged TR741 Aluminium shaft and clamp Low-profile head Wide saddle clamp Rail Clamp Size: 7x7mm Offset: 20mm Weight: 195g (27.2mm, 350mm)Buy Ritchey Components from Chain Reaction Cycles, the World's Largest Online Bike Store.