Serfas Big Stick Mini Bicycle Pump Capable of getting you to extremely precise inflation pressures The switch valve & simple valve designs enable switching between Presta or Schrader valves, while the dual head offers both Our simple screw-on and Quick draw head designs both screw on the valve for a secure fit, even at high inflation pressures Dual Valve pump head - fits presta and schrader valves Alloy thumb lock High volume for quick inflation PSI capacity 100