 It goes right on the hinge of a door that can't otherwise be locked, and it will lock this door from any intrusion. Right, so it doesn't allow the hinge to open and therefore open the door, so it keeps the door closed. Exactly. So if you want more information on the sleeve, contact FightingChanceSolutions.com. That's FightingChanceSolutions.com. Yeah, so if you want more information on the sleeve, call 888-