6 Building and framing accessory and installation components all made of metal, namely, nuts, bolts, screws, washers for use as hardware, studs, hinges, springs for use as hardware, spring clips for use as hardware, pipe couplings, pipe clamps, pipe rollers for use as hardware, pipe hangers, fender hooks for use as hardware, conveyor and trolley rollers for use as hardware, clamps, brackets for use as hardware, tubing clips, and conduit and pipe riser clamps; strut-type structural building and framing products, namely, rolled and extruded continuous slot metal channels; sectional metallic building units, namely, frames of metal for buildings and structures and construction elements of metal in the nature of supports, pipe fittings and couplings and structural joint connectors of metal, all for temporary and permanent construction of buildings and other structures; metal installation products and accessory components, namely, cable trays and supports, conduits, cable saddles and supports, bus bar clamps, and wiring stud nuts; fluorescent fixture fittings and supports in the nature of adjustable framing members, namely, metal mounting brackets for mounting fluorescent lighting fixtures