It is the buyers responsibility to examine all items to determine if an item is safe for use - the buyer accepts all responsibility for use of items purchased
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Campagnolo Quick Release Seatpost Binder Bolt. This is a handy item for sure - typically works wherever you would be able to fit a conventional Campy 8mm binder bolt but you want flexibility instead.
It is also great for frames where the binder ears are messed up and the typical binder doesnt have a good area to bite into - this has big concial washer plates that grip the ears from the outside with lots of contact area. The binder is not lightweight - but it can be a real problem solver and a fun bit of Campy exotica on the cheap. We've sold these on ebay before at $40 - but this isn't ebay.