The Videotel 0822 large red fixture with "OCCUPIED" text has a black front bezel that is 2 3/8" diameter wide x 3/8" tall. This button mounts in any 1" hole and is secured with an included plastic nut. The button can be mounted in any material between 1/8" and 1" thick. The 0822 is extremely reliable and durable. Includes button, fastening nut, 12VDC cluster LED light bulb, light holder and N.O. (normally open) / N.C. (normally closed) switch.