The Kodia 551 Black Indicator Bolt is the matt black version of the 551 bathroom and trial room indicator lock, suitable for railway use. The black bolt case, keeper and outside plate contrast with a bright metal bolt, which a black thumb turn drives into the keeper as a long iron rod. The outside plate shows a curved VACANT indicator window above a bright slotted turn, with the Kodia mark printed beneath, so people outside can see whether the room is free. The 551 also comes in SS and Antique finishes. Part numbers: 551