This indicator door lock adopts zinc alloy and stainless steel, sturdy and durable, easy to install. Red and green color will indicate whether the room is occupied, applicable to public toilet, restroom and bathroom.Features: The door lock is made of zinc alloy and stainless steel, anti-rust, sturdy and durable, with surface. Can be used for public toilet, restroom and bathroom to indicate that the room is vacant or engaged. Red(engaged) and green(vacant) color is easy to recognize, so it is a universal indication. Easy to install, suitable for partition door and bulkhead door. Applicable to public toilets such as airport, station, hospital, shopping mall and office building. Specification:Condition: 100% Brand NewMaterial: Zinc Alloy + Stainless SteelMain Color: SilverApplicable Plate Thickness: about 12~18mmCenter Diameter: approx. 17mm / 0.67inHole Distance: approx. 36.5mm / 1.44inWeight: approx. 307g / 10.8ozPackage List:1 * Indicator Door Lock1 Set of ScrewNote:1. Please allow 0-2cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.