6 Metal goods, namely, air ducts and air regulation parts, namely, quadrants, castings, ball joints, damper brackets, damper pins, clamps, duct corners, hooks and brackets; metal pipe supports and pipe support parts, namely, clamps, brackets, back plates, wedge nuts, channel nuts, channel fittings, connectors, corner plates, nuts and bolts; and metal roofing fixture parts, namely, gutter clamps, gutter clamps with nails, roofing clamps, hinges, anchors, and snow guards