Access chamber covers of metallic materials; Air grilles of metal; Air vents of metal for buildings; Covers of metal for use in cable channels; Covers of metal for use in drainage channels; Covers of metal for use in gullies; Floor drains of metal; Grilles of metal; Grilles of metal for pavements; Grilles of metal for roads; Drain covers of metal; Drainage channels of metal; Drainage plates of metal; Drainage profiles of metal; Drains made of metal; Floor drainage channels made of metal; Metal drainage apparatus for use in the collection of flood water; Tree gratings of metal for draining thoroughfares