Couplings of metal for chains; Door bolts of metal; Door frames of metal; Door handles of metal; Door knockers of metal; Door panels of metal; Latch bars of metal; Metal guardrails; Metal padlocks; Spring locks of metal, other than electric; Strongboxes; Bars for metal railings; Doors of metal; Fences of metal; Locks of metal for vehicles; Locks of metal, other than electric; Staircases of metal