The Kodia 551 SS Indicator Bolt is a bathroom and trial room indicator lock in a satin stainless steel finish, suitable for railway use. A thumb turn on the bolt case drives a long iron rod into a separate keeper, and the outside plate carries a curved VACANT indicator window above a slotted turn, so people outside can see whether the room is free. The bolt case has four screw holes, the keeper two and the outside plate two, with the Kodia mark printed on the plate. The 551 also comes in Antique and Black finishes. Part numbers: 551