- Size Options: The copper expander tube is available in multiple sizes for flanging: 3/4 inch (19 mm), 5/8 inch (15.9 mm), 1/2 inch (12.7 mm), 3/8 inch (9.5 mm), and 1/4 inch (6.3 mm). The expander copper tube sizes include 17 mm, 14 mm, 11 mm, 7.8 mm, and 5 mm, with a hexagonal shaft size of 6.35 mm. - Durable Material: Constructed from high-quality 45# steel, this pipe expander offers exceptional hardness and stability. Its blackened surface enhances wear resistance and prevents sticking, ensuring long-lasting performance. - Easy Identification: Each pipe extension is clearly labeled with its size and type, allowing for quick identification of the specifications you need, which streamlines your workflow and boosts efficiency. - Versatile Compatibility: The calibration mandrel features a standard hexagonal shaft interface, making it compatible with a variety of drills and cordless screwdrivers. This versatility allows it to integrate seamlessly with most rotary tools. - Practical Applications: 1. Ideal for HVAC professionals needing to flare or expand copper pipes for air conditioning installations. 2. Perfect for plumbers or DIY enthusiasts working on plumbing systems that require precise pipe adjustments. 3. Useful for automotive technicians needing to modify or connect copper tubing in vehicles. This copper expander tube is designed to meet the demands of both professionals and hobbyists, ensuring reliable performance in every application.