Metal building materials; doors, gates and sliding gates, including doors, gates and sliding gates for residential, commercial and industrial properties, garages and carports; garage doors and door suspension units and parts and fittings therefor; panels for fencing, shading and decorative purposes; crush barriers; shutters and security grilles for door and window apertures and parts and fittings therefor within this class all made predominantly of metal; overhead suspension tracks and trolleys and door fittings for such tracks and trolleys; equipment and devices for sliding, rolling, lifting, guiding, locking, opening, hinging and bolting of doors, gates and windows all being goods in this class made predominantly of metal