These thread adapters are for threaded light tubes. Widely used for connecting LED lights, pendant lights, chandeliers, electrical parts, or making other lighting projects.SpecificationThread Height: 12 mm/0.5 InchMale Thread Size:9/16"-18UNFFemale Thread Size: M10Thread Pitch: 1mmMaterial: MetalColor: ChromePackage List: 5 Pcs x Thread Reducing NutAdvantages1. The nut is made of metal material which is anti-rust, anti-corrosion, durable, can be used for a long time.2. The reducing nut can be converted into 2 different threads, which is easy to use.InstructionWhen you need to connect different brackets, screw the light fixture into the nut to change the thread size.NOTE: Please check the thread size before ordering to make sure it will fit your project.