Made of stainless steel, it is rust-proof, has a smooth surface and is very durable. Surface mount using set screws. Smooth and trouble-free operation. The Vacant (green) / Engaged (red) indicator light indicates whether the room is occupied. Scope of application: Emphasize elegant, clean and wear-resistant public places, such as: airports, stations, hospitals, offices, restaurants, shopping malls, offices and other public toilets. describe: The lock is made of zinc alloy, which is rust-proof and has a smooth surface, which is very durable. The vacancy (green)/use (red) indicators show whether the room is occupied. Delivery Quantity: 1 Piece Color Material: Stainless Steel. Applicable plate thickness: 12-18mm. Outer lock: (L) x (W) 6.2cm x 4.2cm (approx.). Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.