Cotter pins of metal; Door fasteners of metal; Door stops of metal; Drain pipes of metal; Elbows of metal for pipes including those from alloy steel and titanium; Hinges of metal; Junctions of metal for pipes including those from alloy steel and titanium; Magnetized metal hooks for the sanitary hanging of a towel during fitness training and other athletic activities; Manually operated metal valves; Metal locksets; Metal spacer brackets; Metal water pipes