Ключевые слова: abstract, aluminium, background, beautiful, black, business, chain, close, closeup, concept, detail, element, equipment, forbidden, frame, gate, grunge, hanging, heavy, industrial, industry, iron, isolated, link, links, lock, metal, nature, object, old, outdoors, pattern, power, protection, retro, rusty, safety, secure, security, shape, shiny, silver, steel, stone, strength, strong, structure, symbol, texture, vintage,