Buckles of common metal; Ceiling supports of metal; Elbows of metal for pipes including those from alloy steel and titanium; Junctions of metal for pipes; Metal clamps; Metal elbows for pipes; Metal fasteners, namely, bolts, nails, rivets, screws; Metal flanges; Metal hose clamps; Metal junctions for pipes; Metal pipe fittings; Metal spacer brackets; Metallic flanges; Nuts of metal; Structure joint connectors of metal