These copper pipe fittings are widely used on water plumbing, air conditioner, heat pump system, and refrigeration system. Good replacement for changing the direction of your copper pipeline.Specification:Color: Copper ToneMaterial: CopperInner Diameter: 16mm / 5/8 inchOuter Diameter: 18mm / 0.71 inchThickness: 1mm / 0.04 inchTotal Length: 45mm / 1.77 inchTotal Width: 45mm / 1.77 inchFor 16mm (5/8") outer diameter copper pipe. Packing List: 5 Pcs x Copper Pipe FittingAdvantage:The copper pipe fitting is made of copper material, with good thermal conductivity. Have a good performance on transferring the Heat.Smooth surface and no burrs.Instruction:Cleaning the connection surface, and then soldering to install.NOTE: Need to confirm the pipe size before ordering.