This indicator door lock adopts zinc alloy, sturdy and durable, easy to install. Red and green color will indicate whether the room is occupied, applicable to public toilet, restroom and bathroom.Specification:Condition: 100% Brand NewMaterial: Zinc AlloyMain Color: SilverIndication Color: Red, GreenApplicable Plate Thickness: about 12~18mmHandle Size: approx. 74 x 31mm / 2.91 x 1.22inDiameter: approx. 5.4cm / 2.13inThickness: approx. 9mm / 0.35inHole Distance: approx. 37mm / 1.46inWeight: approx. 204g / 7.2ozPackage List:1 * Indicator Door LockNote: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.