Description:  6Pcs 1/4-7/8'' Imperial Hexagonal Tube Expander 37-47 Length Swaging Tool Drill Bit Air Conditioner Copper Pipe Flaring Tool.     Specifications:  Product Name:Swaging Tool Drill Bit Set ;  Material:Metal;  Color:Black;  Size:1/4'' (6.35mm), 3/8'' (9.5mm), 1/2'' (12.7mm), 5/8'' (16mm), 3/4'' (19mm), 7/8'' (22mm);  Length:1/4'' (37mm), 3/8'' (40mm), 1/2-7/8'' (47mm)   Quantity:6pcs;     Features:  -Swaging Tool:A product of the swaging process with this tool making their way into HVAC systems lineset.  -Function:When air conditioning is installed, expand copper tube, make two copper tube mutual link. (To be installed on hand electric drill.) -Material:Durable and not easy to break, wear resistant to use.  -Multi Size:7/8", 3/4", 5/8", 1/2", 3/8", 1/4", 6 different sizes per set of your choice to meet your needs.  -Easy to Install:Perfect for installers, no matter if you are just learning or have been doing it.     Package Included:  6 X Swaging Tool Drill Bit