1、Enhanced Safety: Quick lock on tire chuck with 3 grips securely locks onto tire valve stems with a gentle push, ensuring no air leakage when inflating, enhancing overall safety. 2、Easy to Operate: The lock mechanism securely grips the tire valve stem, allowing for inflation without the need to hold it by hand, freeing your hands for easy monitoring of tire pressure. 3、Sturdy Construction: The tire air chuck is made of solid brass nut and metal alloy, ensuring durability and reliability, resistant to oxidation and erosion for long lasting use. 4、Wide Application: Suitable for most tire gauges and inflators with a 1/4 inch FNPT, the locking tire air chuck effectively controls airflow during inflation without exceeding the maximum pressure of 150PSI. 5、Standard Bore Size: Designed to fit for Schrader Valve (0.305in OD) and most tire gauge inflators, the lock on air chuck suitable for cars, off road vehicles, trucks, and more for accurate tire pressure maintenance. 6、Closed Flow Design: Locking the tire chuck enables the shut off valve to stop airflow when the valve stem is not open, ensuring no airflow until securely engaged.