SeonFook 5pcs Swaging Tool Drill Bit Set Copper Pipe Flaring Tools with 1/4'' 3/8'' 1/2'' 5/8'' 3/4'' Bits Multifunction Tube Expander Portable Drill Bit Repairing Kit 1/4-Inch Hex Shank HVAC Tool - SF-US-001

• Come with 5 different sizes: 3/4", 5/8", 1/2", 3/8", 1/4". Hex Shank Diameter: 1/4 inch. They can meet your various work needs High Quality Material: Made of bearing steel for durability. Flares drill bits have high and uniform hardness and wear resistance, will always have the size and fit perfectly Pipe Expander: The innovative drill bit expander for expanding tubes using heat by friction way more surface of between the flare and the valve Copper Pipe Swaging Tool: When air conditioning is installed, expand copper tube, make two copper tube mutual link (The drill bit is installed on hand electric drill) Drill Bit Expander This swages tool present a perfect depth and a tight fitting, which will make the brazing easier, reducing the fatigue stress over the coupling area