What is this?The M10 coupling nut can connect two M10 all threaded pipes together. It is a common light fixtures accessory kit for the repairing and restoring of ceiling lamps and chandeliers, or DIY making.What will I get?Material: Iron ElectroplatedColor: BlackThread Size: M10Thread Pitch: 1mmLong Coupling Nut Size: 11.5x300mm / 0.45"x11.8" (Diameter*Length)Threaded Pipe Length: 40mm / 1.58"Package Content: 4 x Long Coupling Nut, 8 x 40mm Long Thread Pipe, 8 x Small Hex NutAre there any advantages of the product?Made of metal material, electroplated surface, with good appearance, and durable to use.Easy to use, no need for tools. How to use it?Easy to install, each coupling nut can connect two pipes on both end. After that, use the small hex nut to fasten.