1. is committed to providing products that are aesthetically designed, smartly manufactured, and easy enough for novices to experts. 2. swaging tool drill bit set includes common HVAC pipe diameters, such as 1/4inch, 3/8inch, 1/2inch, 5/8inch, 3/4inch, and 7/8inch. The sufficient quantity and complete specifications are suitable to meet work needs. 3. These tube expanders are made of bearing steel material, which are durable, have good performance, and long service life. 4. These manual copper pipe swaging tools are suitable for standardized hard and soft copper, and easy-to-braze swaging sets. 5. The forging stopper will provide a large swaging depth to achieve a proper fit. And a full range of forging tools makes it easier to expand HVAC pipes. 6. During the die forging process, the ductility of copper/aluminum should be preserved to avoid cracks and leakage. 7. Besides, when installing the air conditioner, expand the copper pipe to connect two copper pipes. (It needs to be installed on a hand drill). 8. They will be a useful assistant for work and life. 9. 6pcs Tube Expander Drill Bit Repairing Set 10. Made of bearing steel material, with a blackened surface treatment 11. Fit for standardized hard and soft copper, and easy to braze swaging set 12. Preserve the ductility of copper/aluminum during die forging to avoid cracks and leakage 13. Forging stopper will provide a large swaging depth to expand HVAC pipes 14. Common HVAC pipe diameters include 1/4", 3/8", 1/2", 5/8", 3/4", 7/8" 15. The package includes 6 x tube expanders