Features Preserve Ductility During Use: Prevent cracks and leakage in copper or aluminum pipes with our specialized design, ensuring reliable performance for your HVAC installations Versatile 6-Piece Set: Includes 6 different sizes to meet all your daily maintenance needs, making it an essential addition to your hardware tools collection Efficient Pipe Interconnection: Designed specifically to expand copper pipes, facilitating seamless connections for air conditioner installations and repairs Enhanced Durability and Longevity: Crafted from 45# steel, our drill bits boast excellent workmanship, ensuring easy installation and a long service life for consistent usage User-Friendly Design: Featuring a professional structure and intuitive operation, this manual tube expander drill bit set is easy to use, even for beginners Features: 1、The tube expander drill bit set can be used to preserve the ductility of copper or aluminum during die forging to avoid cracks and leakage. 2、The set contains 6 expanders of different sizes, which can meet the needs of daily maintenance. 3、The set is used to expand the copper pipe to make the two copper pipes interconnected when the air conditioner is installed. 4、With excellent workmanship, these drill bits are easy to install and has long service life. 5、The forging stopper will provide a large swaging depth to achieve a fit. 6、With profional design and reasonable structure, the set is easy to use and operate and has good performance. 7、 material can make sure the durability and stability of the product. Specification: Item Type: Tube Expander Drill Bit Set Material: 45# steel Reaming Specification: 7/8 inch, 3/4 inch, 5/8 inch, 1/2 inch, 3/8 inch, 1/4 inch Purpose: After installing the air conditioner, expand the copper pipe to connect the two copper pipes. Package List: 6 x Tube Expander Drill Bit Set Note: The tube expander drill bit set must be installed on a manual electric drill. Package List 6 x Tube Expander Drill Bit Set