The nuts are mainly applied for jointing two screw pipes. Good light fixtures for fastening and extending thread pipes. Used on repairing or replacing chandeliers, ceiling lights, or DIY projects.SpecificationMaterial: Carbon SteelThread Size: 1/8IP(1/8-27)Hex Width: 14mm / 0.55 InchHeight: 15mm / 0.59 InchPacking List: 15pcs x Hex Coupling NutAdvantage Carbon steel material can provide a good hardness and is not easy to deform. Also, the zinc coat has good rust resistance, and it can prolong product's service life.Instruction Convenient to use, just connect two threaded tubes, no requirement for a tool.NOTE: Please confirm the thread size. 1/8IP thread diameter is approx 3/8 inch.