This is a Mavic freehub body for Campagnolo. 8mm bearing throat. They come in 8mm and 9mm - this is the smaller. It was on a Mavic Ksyrium road wheelset. If you are interested but not sure what size you need - message me and I can advise. I'm willing to give this away for the cost of shipping. Just don't need/want to get to a good home.