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Concealed Door Position Switch for Metal doors.Both components require drilling a 3/4 (19mm) diameter hole in the door and frame directly opposite one another. The large magnet is needed to overcome the shielding effect of a steel door.

Concealed Door Position Switch for Metal doors.Both components require drilling a 3/4 (19mm) diameter hole in the door and frame directly opposite one another. The large magnet is needed to overcome the shielding effect of a steel door.

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