Material: Our air chuck set is mainly made of brass which is durable and sturdy, designed with good corrosion resistance and you can use them for a long time. Closed Flow Air Chuck:1/4inch FNPT air inlet, ball air chuck function is to enable the shutoff valve to shut down the air flow when the stem is not opened, suitable for general commercial and industrial air filling applications. Open Flow Tire Chuck:1/4inch Female NPT THREADS fit most air inflators.The open flow design allows air to flow even when not engaged to a valve stem.Upgraded heavy duty brass air chuck easier locking onto stem valves FNPT Dual Head Air Chuck: 1/4inch FNPT air inlet,the maximum air pressure is 150 pounds per square inch.2-IN-1 Multifunctional air chuck with the function of checking pressure and inflation colour:yellow Material:brass Package Contents: 1 x Closed Ball Air Chuck 1 x NPT Dual Head Air Chuck 1 x Closed Flow Tire Chuck Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.