1、NUT SPECIFICATIONS: These hex coupling nuts are designed with female thread and hexagonal rod to provide good angular granularity for tools. 2、STAINLESS STEEL: Made of excellent 304 stainless steel, rustproof and durable, has good corrosion and wear resistance, with a long service life. 3、EASY OPERATION: The coupling nut connects the two piece threaded rod from the opposite end, for hanging various items vertically or horizontally. 4、WIDE APPLICATION: Hex nuts are suitable for connecting bolts, studs, machine screws, threaded rods, etc., suitable for indoor and outdoor use. 5、5PCS IN 1 SET: Including 5pcs hexagonal coupling nuts, with standard size and thread, sufficient quantity for installation and replacement.