Ключевые слова: background, block, bolt, carbon, closeup, connection, construction, design, dirty, engineering, equipment, facility, fasteners, flange, frame, gasoline, gray, hardware, horizontal, industrial, industry, iron, joint, macro, manufacturing, metal, metallic, nobody, nut, old, part, pipe, pipeline, red, repairing, rusty, safety, screw, screwed, shiny, silver, solid, spiral, stainless, steel, store, tapped, technician, technology, thread, togetherness, tool, trading, tube, valve, work,