Ключевые слова: abstract, activity, aluminum, background, chrome, closeup, concepts, connection, equipment, fastening, female, head, heap, hexagon, hexagonal, industrial, industry, macro, many, mechanical, metal, metallic, nut, objects, part, screw, screwnuts, small, stainless, steel, strong, technology, thread, tighten, togetherness, tool, turning, up, wrench,