High Quality: Made of fiberglass material, includes 15 rods (3/16" diameter) with threaded brass connectors, M5 screw thread/Nut, acrylic connection, brass push and pull rods Wide Usage: For running wire through walls, attics, crawl spaces, sub-floors and suspended ceilings, great insulating property Excellent Extensibility: Rods can be used individually or threaded together for desired length, can be extended up to 50 feet Convenient To Store: Bright blue rods are highly visible and comes with plastic storage case, very convenient to store More Advantages: The item is Strong flexibility (But do not bend forcibly while using), wear-resistant, corrosion-resistant and anti-oxidation