Features 1. High Strength Alloy: The copper tube swaging bit features high strength and speed alloy. The swaging bit for copper pipe is simple and easy to use, which can be directly connected to the interface of electric drill. 2. Time-saving: The copper tube drilling bit is efficient and fast, which saves more time, compared with manual models. 3. Tip: the copper tube stamped drill bit is suitable for tube diameters between 6mm-16mm / 1/4-5/8" (about) 4. Multiple Purposes: The copper tube swaging bit can be an insertion aid tool (Phillips screwdriver, etc.), which can be used as a manual tube expander. 5. Quality Guarantee. We have faith in our product and always back it up with trustful customer service, please reach out to us if you have any questions or problems about our products. Specification Material: Steel Color: Black Size: 1/4"(6mm),3/8"(9mm),1/2"(12mm),5/8"(16mm) Package Includes: 1 x Electric Tube Expander Package Includes: 1 x Electric Tube Expander