This premium air chuck with tire valve fine thread, was specially designed to resolve the annoying air leakage problem by converting tire inflator's screw-on (twist-on) air chuck to lock-on air chuck. Screw on this premium air chuck adapter into tire inflator's hose end, then clip it onto tire valve stem, strong hooks on and easy depress make it a perfect no air leaking and quick efficiency inflating. Specs: Tire Chuck: Schrader Valve tire chuck. Connector: Schrader Valve fine Thread(0.305"outer diameterx32TPI). Features: Solid construction, portable tire inflator tire filling air chuck, for bike, motorcycle, car etc. Open flow lock on thumb-up air chuck, for easy and quick hands free inflation. Excellent tight seal lock-on air chuck, make sure no annoying air leaking. Standard US Schrader Valve fine thread connection, the same with tire valve stem(tire nozzle)compatible with inner thread of twist-on air chuck. Use under 250psi. Buy with confidence,100% satisfaction guarantee，1 year warranty.