The PCKT snap tool provides a safe and discreet way to transport cartridges on your key chain. Screw a magnet on the end of your cartridge and insert it into the snap tool. You can even colour coordinate the snap tool with your favourite PCKT One Plus.
The top end of the snap tool also functions as a tool to adjust squished down pins on the magnetic contacts. So you can stop carrying pins, paper clips and toothpicks.