The Videotel 4734 large blue button 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. Button can be mounted in any material between 1/8" and 7/8" thick. The 4734 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.