Aluminum alloys; Boarding stairs of metal, mobile, for passengers; Loading pallets of metal; Metal clevis fasteners; Metal motorcycle stand that may be raised and lowered by non-powered means; Metal packaging trays; Metal portable staircases; Metal portable stairs; Metal portable stairs for pets; Metal ramps for use with vehicles; Metal swimming pool ladders; Scaffolding of metal; Stair treads of metal; Step stools of metal; Tool boxes of metal, empty