Building materials made primarily of metal, including metal building units including metal profiles, sections of common metals, carbon steel sections, light steel sections, galvanised and coated steel sections, rolled and extruded metal sections, channels, concrete inserts, angle irons and the like; plates including base plates and mounting plates; fittings including plate fittings, angle and angular fittings, shaped fittings such as z-, u- and wing-shaped fittings, and the like; trolley assemblies; hangers, guides, rollers and sliders; brackets, attachments, bands, cleats, straps, joiners, supports, connectors and the like; trays; clamps including pipe clamps, saddle clamps, band clamps, beam clamps, spider clamps, yoke clamps and the like; clips including channel clips, pipe clips, shankless clips, nut clips, twist clips, spring clips and purlin clips and the like; fasteners including nuts, bolts, washers, studs, screws, rivets, anchors, threaded rods and rod couplers and the like; springs; hanging systems; framing members for use in building, scaffolding, racking, shelving and support structures and the like, particularly pipe support structures; metal structures; framing systems