Product description: Better Auto-Locking: Upgraded heavy duty brass air chuck make it easier locking onto stem valves - no air leakage ever since. Brass Air Chucks: 1/4" NPT Thread Universal Connect. Heavy Duty Special Designed: Maintain correct tire pressure, reduce tire wear and extend tire life. Convenient Use: The air chuck with clip can be easily fixed to the valve stem. And the screw tire chuck can also tightly hold the tire valve to ensure sealing. The former can directly clip your car's tank valve. And the latter need to be put on the valve and then swirl the chuck, simple operation will not spend you too much time to apply. Practical and Durable: The air chuck is made of quality brass, strong and durable to use. It's not easy to deform or damage, and can serve you for a long time. The maximum pressure is up to 250 PSI, which is applied for tire inflators and pressure gauges.