Ключевые слова: abstract, background, bar, black, building, business, circle, coil, concrete, construction, curve, fence, floor, foundation, frame, gray, grid, heavy, image, industrial, industry, iron, material, mesh, metal, metallic, object, pattern, products, rebar, reinforcement, rod, roll, shape, shiny, silver, site, spiral, square, stack, steel, strength, strong, structural, structure, support, surface, textured, tube, welded, wire,