This is the old-school tool to air down your tires quickly with my modern twist. This compact tool has no moving parts to fail. It is long enough and small enough to access any valve stem location easily. The working end of the tool has a ball and spring retaining system to hold the core once it is removed from the stem. The 3D printed handle has a secret compartment to hold three spare valve cores ( included ) if you just happen to fumble one on the trail. Those spare cores are extracted from the handle by a small magnet in the end of the tool. This unit is packaged in a heavy duty screw top container for safe keeping.