Ducts of metal for air-conditioning installations; Metal hardware, namely, general use wall and ceiling mounts for audio, video or computer equipment; Metal hardware, namely, washers; Metal mounting brackets for general use; Metal rods for brazing and welding; Metal screws; Metal vent cover for HVAC ducts; Silver solder; Solder cream; Valves of metal other than parts of machines including those from alloy steel and titanium; Water-pipe valves of metal