Satin Chrome Plated Brass Indicator Bolt

When the bolt is slid into the receiver plate, the door is locked. As the bolt is operated the white or vacant indicator viewed from the outside of the door, is replaced by the red or engaged indicator to show that the room is occupied. The plate fitted to the outside face of the door houses an emergency release facility that is usually operated by either a coin or a screwdriver. This allows emergency access to the room.