This listing is for a bit of an odd-ball. This is a new HALF of a mdc 14" vacuum quick access door. This is the half of the door that would bolt to a chamber, with a conflat knife-edge on one side, and an o-ring seal on the other. Clearance holes for the bolts. But the half of the window that would swing open is not included. Not sure how these got loose this way. Maybe they were intended for some specialized custom door. But in any event all of the expensive machining is part of the door half offered here. If you want to go through the effort of making the other half, you can save some serious $$$$ as there complete doors list for almost $3k!