The tyre inflator firing pin is for use with CO2 canisters (available separately) and is designed to be a quick way of making small increases to the pressure in your tyres. These are an essential tool to carry in a rally car, especially where you have dropped your tyre pressures multiple times throughout a day of stages, only to be faced with a delay or large gap in the schedule to find your tyres are now below their required setting! Also suitable for trackdays and circuit racing where a small pressure adjustment is required. Product may vary in colour from item photographed.