100-5004-905
Seat post collar designed for 27.2mm posts,
Clamp Diameter: 31.8mm clamp diameter
Ordered this for my Lauf Seigla. This clamp has a standard OD of 31.8mm, but the Lauf has an odd 31.2mm side. This clamp would have worked, but ended up going back to the proper 31.2mm clamp. But not to worry, this ENVE clamp will be used on another bike!