Model HA Inferno air-fuel quick connect swirl tips have a specially-designed insert that deliver reliable swirl combustion performance every time. It provides a consistent, hotter, flame that will engulf and wrap around the work-piece for maximum efficiency. They are constructed from thick and strong 304 stainless steel tube stock designed to be durable and long-lasting. They are designed to work and integrate with today's existing quick-connect air-fuel handles, allowing contractors to simply and quickly connect to their existing torch handles. For use with acetylene.