NOS Campagnolo Seat Post quick release
bolt diameter is 8mm
unclamped the exposed bolt portion to the end of the threads is approx 46mm, clamped it's approx 44


ASK QUESTIONS if you need more info. 
International buyers: please inquire regarding shipping costs. ebay requires insurance, which is only possible with Priority or higher levels of postal service, and this can get very expensive.
All customs fees are the responsibility of the buyer.