CNC Precision: CNCmachined aluminum body for reduced weight. Hardened stainless steel puncturepin for durability. TwinChuck Connection: Lezyne TwinChuck head threads directly onto both Presta and Schrader valves. Trigger Operation: Trigger operation allows for easy and precisely controlled inflation. Threaded Cartridges: Accepts all threaded Lezyne CO2 cartridges.