The Metron post’s one-piece carbon fiber shaft and head are topped off with a forged alloy Minimal Top Clamp, giving a full range of adjustment and secure saddle mounting at a very low weight. There’s also the option of mounting a Shimano Di2 battery in the bottom of the post. Forged alloy Minimal Top Clamp (MTC) One piece continuous carbon fiber construction Fit Ø7mm standard rails and 7X9mm oval rails WE & Di2 compatible UD carbon finish