door opening and closing components made of metal, namely bars, bolts, brackets, butts, bearings, nuts, metal ratchets, rings, shims, arm caps, screws and shells, door thresholds, and springs; mechanical door closers, and mechanical door coordinators comprising door closers, door stops, and door releases; door closer rods and shoes, valves, and covers and arms, all for door closers, door holders, and door controls; mechanical door holders, door holder/stops, threaded metal fasteners, mechanical floor closers, mechanical floor closer/coordinators, mechanical gate closers, hinges, latches, metal mounting cases, pins, pivots, and pivot sets, all for controlled opening and closing of doors, gates, and other entry points; and metal plates for use with door holders, door closers, and door controls, namely floor plates, door dress plates, cover plates, mounting plates, frame plates, back plates, filler plates, retrofit plates, and access plates