This round coupling nut kit is designed for connecting or extending purposes. Good for DIY projects, such as lamp decor, toy model shafts, doorplates, billboards, and posters. Suitable for use in a variety of settings, including homes, workshops, and classrooms.SpecificationMaterial: Carbon SteelThread Size: M4Thread Tube Size: 4.8mmx40mm / 0.2 inch x1.6 inch (Outer Dia.x Length)Fully Threaded Rod Length: 20mm / 0.79 inchScrew Length: 12mm / 0.47 inchPacking List: 1 x Coupling Nuts Kit(Included 8pcs coupling nuts, 6pcs threaded rod, 16pcs internal hex head screws)AdvantageMade of carbon steel material for durability and wear resistance. At the same time, it comes with screws and fully threaded rods for easy installation.