Honeywell Ademco 958 Overhead Door Contacts Can be added to a wireless home security system with video surveillance cameras and more Adjustable magnet with L bracket for fast installation 24 in. 24 in. Armored cable is standard Standard gap -- 2-3/8 in. Epoxy sealed for protection from moisture and impact. Rugged Shock Absorber design protects reed against flex or damage to housing.