Features: The air pump extension hose is an extension of the tire valve, making the tire inflation process easier. The air pump extension tube can quickly connect and disconnect the tire nozzle, thus ensuring that the air pressure inthe tire will not leak when the tire is inflated and disconnected. The inflatable chuck has high flexibility, it can be easily bent, and the threaded interface design is adopted, so there is no need to worry about it being easily loose or leaking. The air pump extension tube is made of durable materials, resistant to wear and deformation, and the hose is not easy to break. The main application scope of the pneumatic chuck: tire inflation of cars, bicycles and motorcycles. Instructions: Connect the external thread to the outlet nozzle of the inflator, connect the quick connect inflation chuck to the tiremouth. Standard us fine thread connection (5/16"x32TPI), the same as the thread on all USA standard car valve stems, compatible with inner thread of twist-on air chuck. Convert tire inflator twist-on air chuck to lock-on air chuck. Connection. Screw adapter end onto original inflator hose, press to clamp adapter head onto tire valve, start the inflator for a quickly and none leaking inflation. Specifications: Connection thread: 0.305"x32TPI (5/16"x32TPI) Hose length: 10cm/20cm/40cm/60cm/80cm Connection type: Thumb press lock on Air chuck type: Schrader valve Material: all metal air chuck+rubber hose+brass connection fitting Package include: 1 x Locking Air Chuck with Air Hose and Standard Tire Valve Fine Thread Please allow 1-3mm slight deviation due to manual measurement. Thank you!