FAST TO LOCK ON: A locking device on the chuck bitten the tire valve stem so it can be used without hands holding, make your hand free. Just check tire pressure and add air as GOOD SEAL CHUCK: The locking air chuck built with 3 claws that quickly lock on to the tire valve stem by a simple push. Pull back to release,no air leaking. HEAVY DUTY AIR CHUCK: great for inflating /truck/RV tires with air compressor. CLOSE AIR CHUCK: air chuck with a shut-off valve inside that do not allow air to to or from the chuck unless the chuck is engaged with a tire valve stem, which makes them more efficient for using directly on an air compressor hose line. WIDELY APPLICATION: Standard 1/4FNPT locking air chuck means it fit with standard air compressor fittings or fillers. There is a reason these get used a lot on 4-tire inflator/deflator setups., Weight: 0.3637627323 Pounds, Manufacturer: susaa