Overview:

Magnetic Door Holder, Surface-mount with backbox, UL listed, adjustable armature plate, fail-safe operation, holding force 33-lbs (15kg), three voltages: 12VAC/VDC, 24VAC/VDC, 120VAC, extension bars available: ½”, ¾”, 1”, 2”... cast aluminum faceplate, built-in voltage spike suppressor.