6 Small items of metal hardware, namely, welding bolts, metal welding rods for making bolts; materials of metal for electrotechnical installations, namely, clips of metal for cables and pipes, conduit clips, cable clamps, sectional rails, slotted strip iron, sheet metal for cable channels, pegs of metal, nails, threaded bolts; materials for the installation of television and vhf aerials, namely, mast fittings of metal; metal materials for bathroom installations, namely, clips, pipes, series clips for pipes, brackets for gutters, radiator brackets, radiator supports, clips for heating pipes, suspension clamps for pipes, construction elements for lightning protection devices, namely, metal earth clips; wall, ceiling and underfloor trunking, namely, cable junction sleeves of metal; shaped parts of metal for installation purposes, namely, bolts; cable trays and cable ladders of metal, other than electric, used in building construction; cable fittings in the nature of clips; earthquake-proof cable carrying systems of metal in the nature of cable casings, other than electric