The door lock green red indicator is made of copper and stainless steel, which is sturdy and tough, not easy to break or deform, can be used for a long time. The door lock green red indicator is simple to use, simply turn the knob to the inside to lock and unlock, very convenient. Size:5.20X5.20X2.80cm/2.04X2.04X1.10in (rotary knob) Size:7.80X7.70X2.20cm/3.07X3.03X0.86in (lock cylinder) Indicator door lock has the characterized of elegant, clean, wear- at any public places. Open (green)/closed (red) indicator shows whether the room is occupied, convenient and simple. With this indicator door lock, allow your customer recognize which room is available conveniently. No more need for an embarrassing knock to see if there is someone in the restroom. A wide range of applications, door lock indicator can be used in airports, railway stations, hospitals, offices, etc. Color: As Shown Material: Stainless Steel + Copper Package Contents: 1 * bathroom door lock Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.