[Material]All the products are made of Solid Brass construction. Compared with stainless steel and plastic, it is more corrosion-resistant and durable, and can meet the needs of pumping and pressure measurement in various scenarios. [Chucks' Size]The closed flow chuck has 1/4inch FNPT inlet,ball chuck function is to enable the shutoff valve to shut down the flow when the stem is not opened. The Closed Flow Tire Chuck also has 1/4inch Female NPT THREADS fit most inflators. The Dual Head Chuck has 1/4inch FNPT inlet,the maximum pressure is 150 pounds per square inch.All the thread is 1/4inch Female NPT,suit for any 1/4inch Male NPT fittings. [Adapters' Size]1/4inch Coupling x 1/4inch Male NPT Threaded Full Flow Quick Connect which can be used with the 1/4inch Female NPT chuck. Colour: gold Material: brass Package Contents: 1 * closed flow chuck 1 * closed flow tire chuck 1 * dual head chuck 3 * hose quick connect adapter 1 * raw material tape (random color, don't accept the specified color) 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.