6piece set for copper pipe swaging 6piece set includes copper tube expanders in multiple sizes to meet different expansion needs. Provides a safe grip and easy compatibility with standard electric drills. efficiency design: wide expansion range and deep engagement promote efficient expansion and reduce operator fatigue. The various sizes ensure compatibility with different pipelines and enhance versatility. Standard size and secure construction: standard sizes with a stable structure ensure accurate and reliable expansion. The nonslip handle design helps prevent slipping during operation, increasing safety and efficiency when expanding copper pipes. Main purpose and compatibility: can be mounted on an electric drill to expand copper pipes and join two air conditioning copper pipes with a tight connection. Specially designed for expanding copper pipes and establishing reliable connections during air conditioning installation. Practical use scenarios: Air conditioning installation: expanding and joining indoor and outdoor copper lines to form tight connections. HVAC or maintenance: creating secure joints in copper piping during service work. Onsite piping projects: expanding copper pipes in various construction or plumbing tasks using a standard drill.