Ключевые слова: abstract, background, beam, bolt, bridge, building, closeup, construction, design, detail, element, engineering, exterior, frame, girder, gray, grey, grunge, heavy, industrial, industry, iron, material, metal, metallic, old, part, pattern, plate, rivet, rough, screw, solid, steel, strong, structure, support, surface, technology, texture, textured, wall,