Features: It can quickly connect and disconnect the tire nozzle, thus ensuring that the air pressure in the tire will not leak when the tire is inflated and disconnected. Specifications: Connection thread: 0.305"x32TPI (5/16"x32TPI) Connection type: Thumb press lock on Air chuck type: Schrader valve Material: all metal air chuck+rubber hose+brass connection fitting Adopt high pressure resistant outer braided inflatable tube, the pressure resistance is up to 300PSI. Quick connection mouth, high structural durability, beautiful and shiny, no stains. Instructions: Connect the external thread to the air outlet of the air pump Connect the quick-connect inflation chuck to the tire nozzle Weight 20CM: 49.5G 30CM: 51.8G 60CM: 92.5G