Teravail Stratum Seatpost Dialed-in fit. Getting your saddle height and fore-aft position right matters more than most riders think. The Stratum Seatpost makes it easy, with a two-bolt adjustable head and a choice of 0mm or 18mm offset so you can dial in your fit precisely. It covers road, gravel, and mountain setups equally well, and its 6066 aluminum construction is the kind of durable you can rely on without babying it. Features6066 aluminum alloy construction with forged alloy head durable and reliable across road, gravel, and mountain use Two-bolt adjustable head allows precise saddle angle and tilt adjustment0mm and 18mm offset options lets you fine-tune fore-aft saddle position for your fit Tested to ASTM 3 / ISO MTN meets mountain bike safety and load standards | Teravail | Stratum Seatpost 31. 6 X 400Mm, 18Mm Offset | Aluminum