Bolts of metal; Branching pipes of metal; Clips of metal for cables and pipes; Elbows of metal for pipes; Gutter pipes of metal; Junctions of metal for pipes; Nuts of metal; Pipework of metal; Reinforcing materials of metal for pipes; Stair treads of metal; Steel alloys; Steel tubes; Tubes of metal; Valves of metal, other than parts of machines; Water-pipe valves of metal