Easy to Install: Perfect for installers, no matter if you are just learning or have been doing it 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 Swaging Tool: A product of the swaging process with this tool making their way into HVAC systems lineset Material: Made of bearing steel. It has high and uniform hardness and wear resistance, and high elastic limit Function: When air conditioning is installed, expand copper tube, make two copper tube mutual link. (To be installed on hand electric drill) Product description Note: 1. When working, the copper tube will heat up due to friction, which is a normal phenomenon. 2. Cannot be used on impact drills and electric hammer drills. 3. Be sure to maintain stability during operation to avoid vibration, and it is best to add some lubricant to operate (the product does not contain lubricant). Specifications: Material: Bearing Steel Color:Black Shank type: 7mm Triangular Shank Size(Approx.): 7/8"(22.2mm/0.87inch), 3/4"(19mm/0.75inch), 5/8"(15.9mm/0.63inch), 1/2"(12.7mm/0.50inch), 3/8"(9.5mm/0.37inch), 1/4"(6.3mm/0.25inch) Height(Approx.): 1/4", 3/8", 1/2", 5/8", 3/4", 7/8" 1/4": 4.5cm 3/8": 4.5cm 1/2": 5cm 5/8": 5cm 3/4": 5.5cm 7/8": 5.5cm Types(Handle Shape):Triangular Package Included: 6 xCopper Pipe Swaging Tool Drill Bits