Ключевые слова: accessory, background, bolt, build, closeup, construction, engineering, equipment, factory, fasten, hardware, head, hex, hexagonal, industrial, industry, iron, machine, machinery, match, match up, mechanic, metal, metallic, mismatch, nut, part, repair, screw, shop floor, small, stainless, steel, thread, tool, unmatch, useless, work, workshop,