The 1000-24SY BMS High Security Magnetic Contact is a 2 1/2″ long surface mount contact that works well mounted on wood and steel doors where a small contact is preferred. The UL Listed magnetic contact has one CC door switch and one OC magnetic tamper switch when magnet is present. There are four color coded wires and surface mount rare earth magnet. This is the smallest surface mount BMS switch available. Provide your customers more than just a door switch, give them time tested inexpensive Flair high security contacts with built in magnetic tamper.