[Anti-Flow Chucks]Closed-flow tire chucks feature internal "check valves" that prevent air from flowing in or out of the chuck unle the chuck engages the tire valve stem, making them more effective for use directly on the tire. Air compreor hose.[Easy to Use]The lock on the air chuck tire inflator is Perfect for hard-to-acce tires and motorcycle tires, convenient to secure tire beads, easy to connect to the air valve, hands-free operation[Standard Air Chuck]The air tire chuck features 1/4-inch FNPT top threads and can withstand up to 300 pounds of preure. The air-locking chuck securely grasps the valve stem with a quick release button and remains locked on the valve stem, making it difficult to slip off.WIDE APPLICATION - Locking air chuck with 1/4inch F-NPT fits most tire preure gauges and inflators to control air flow during inflation. Do not use more than maximum preure 150PSIClosed flow air chuck: The lock on the air chuck allows the shutoff valve to shut off air flow when the stem is not open, air will flow only when you slide off the chuck sleeve and bite down on the stemColour:silver+goldMaterial:copperSize:Length: about 3.5cmPackage Contents:4 x air chuckOnly the above package content, other products are not included.Note: Light reflection 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.