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