6 Installation materials, all of metal, for electric, gas and water supply installations, namely, small items of metal hardware, namely, metal pipe and cable clips, metal pipe collars, metal spacing clips, metal multi-cable supports, metal carrier trays and slotted iron strips; perforated iron strips; bolt clips of metal and parts therefor; metal bundle clamps; metal dowels; metal profile rails and metal rail connectors, and parts therefor; flex holders, namely, metal cable holders, metal caps for tubing ends; metal terminal sleeves for metal tubes; plug-in cable junction sleeves of metal; wire rope fittings of metal, namely, threaded sockets; metal cable wire fasteners, namely, screwed cable glands and parts therefor, of metal, namely, reductions, extensions, adaptors, locking screws, elbow screw connectors, nuts and pressure screws, nails, ceiling hooks and toggle bolts; cable support systems of metal, namely, cable trays, cable guides, mesh racks, lattice angles, ceiling supports, cable protection conduits, industrial ducts for wiring, wiring conduits, tubes for protecting cables, all being of metal; mechanical fastening elements of metal in the nature of locking screws, elbow screw connectors, nuts and pressure screws, nails, ceiling hooks and toggle bolts, screws, and washers, pipe and cable clips, trunking of metal, grooved iron strips, bracket clamps, metal dowels, profile rails and structural joint connectors of metal and metal cable holders for use with electricity, gas and water supply installations; floor-to-ceiling columns of metal for supplying electricity to workplaces; suspension frames of metal for mounting false ceilings and suspended ceilings, and metal parts and attachment devices thereof, namely, locking screws, elbow screw connectors, nuts and pressure screws, nails, ceiling hooks and toggle bolts, screws, and washers, pipe and cable clips, trunking of metal, grooved iron strips, bracket clamps, metal dowels, profile rails and connectors of metal, cable holders; framework of metal for cable support systems for attaching to floors, ceilings and walls comprising hanging rods, carrying consoles, clamp adapters and head plates; metal hardware for fastening rails, namely, fastening plates, central suspensions, namely, grooved iron strips, bracket clamps, metal dowels, profile rails and connectors of metal, spacer profiles, suspension brackets, angle profiles, mounting plates, mechanical fastening elements and fastening rails, all being of metal, and parts therefor of metal; suspension frames of metal for mounting false ceilings and suspended ceilings, and parts and attachments therefor, of metal; ceiling support profiles of metal, and parts therefor of metal; suspension systems of metal, consisting primarily of metal threaded rods, metal non-electric wire cables and metal chains, and parts therefor of metal; flange fixation systems of metal, consisting primarily of metal flange clamps, brackets and suspending brackets; cable guiding and support framework of metal for maintaining the functioning of electric installations in the event of fire