These Peaty's CO2 spare cartridges are suitable for the Peaty's Holeshot CO2 pumps or any other CO2 pump with screw thread. These cartridges help you to inflate your tyres in no time without having to pump endlessly with a mini hand pump. Simply screw this cartridge onto the CO2 pump and within seconds you are back on the road. This small size fits in any toolbidon, saddlebag or back pocket. Included is the unique Peaty's Freeze Protector. This protects your hands against freezing during and after inflating the tyre.