1. AIR TIGHT SEAL CHUCK: The locking air chuck features three clamps that quickly lock onto the tire valve stem with a simple push. Pull back to release; no air leaks. 2. EASY TO USE: A locking device on the chuck bites the tire valve stem so it can be inflated hands. You can focus on the tire gauge while inflating to your desired pressure. 3. BUILT TO LAST: The air chuck is made with a solid brass nut and nickelplated iron, durable and resistant to oxidation. Maintains reliable performance for many years. 4. WIDELY COMPATIBLE: The locking air chuck uses a 1/4 inch FNPT connection and fits most tire gauges and inflators to control air flow during inflation. Do not exceed the maximum pressure of 150 PSI. 5. USE SCENARIOS: Home garage: quickly connect to a car tire and inflate to the target PSI without keeping your hands on the valve. Small workshop: pair with standard inflators and gauges to efficiently inflate multiple tires with precise pressure control. Onthego maintenance: use with portable inflators for motorcycles or lightduty tires, enabling hands operation and accurate pressure setting.