LOX 12VDC Magnetic Door Holder Wall Mount General DutyThe LOX R40 Door Hold Open Magnets are operating on a fail safe principle similar to common Electro Magnetic Locking Devices. Door Hold Open Magnets consist of a round electromagnetic lock and steel armature plate. Doors with Door Hold Open Magnets installed are usually required to remain in an open position for the general public or pedestrians and can be released by dropping the power to the device. The R40 Series devices are WALL mounted and come