RITCHEY WCS 1-BOLT SEATPOSTRitchey has been making some of the highest quality bicycle components in the industry and they continue to make some of the best stuff out there. The Ritchey WCS 1-Bolt Seatpost is a 3D forged 7050 alloy post that has a single bolt actuation that provides easy adjustability and simple security. The clamps are interchangeable with optional clamps so you can use carbon railed saddles. Features3D forged 7050 alloy7x7mm saddle rail clamp included Single bolt actuation provides easy adjustability SPECIFICATIONSDiameter27. 2, 30. 9, 31. 6mm Length350, 400mm Offset20mm Material7050 aluminum Intended Use Road, mountain Weight195g (27. 2, 350mm) | Ritchey | Wcs Alloy 1-Bolt Seatpost Matte Blk, 31. 6, 20Mm Back, 400Mm Length | Aluminum