Brass compression is usually used to connect air, water, and oil pipelines quickly and simply; Suitable for connecting and fixing nylon pipes, copper pipes, aluminum pipe joints, etc.SpecificationColor: Gold ToneMaterial: BrassFit Tube ID: 4mm / 0.16"Insert Size: 2.5 x 4.5 x 10.5mm / 0.1" x 0.18" x 0.41"(OD*Base Dia*H)Ferrule Size: 6mm x 4.5mm / 0.24" x 0.18"(OD*H)Nut Size: 8mm x 11.5mm / 0.31" x 0.45"(Hex.W * H)Thread Size: M8*1.0Package List: 10 x Sleeve Ferrule, 10 x Insert, 10 x NutAdvantageMade of brass material, it is ductile at high temperatures, resistant to corrosion, and high pressure, strong and durable, and can be used in many different types of environments.Fittings are easy to assemble without the need for welding, flaring, or deburring and can be connected directly to copper, brass, aluminum, or plastic tubing.