: Made of ball bearing steel, it is practical and durable. The flares will always have the same size and will fit perfectly; The swages present a perfect depth and a tight fitting, that will make the brazing easier, reducing the fatigue stress over the coupling area. SWAGING TOOL: A product of the swaging process with this tool making their way into HVAC systems lineset. EASY TO INSTALL: Heat by Friction -swaging pipe . Preserves copper malleability during the molding process, for a leak-tight fitting.Fits into any Drill - Fit for any rig - work more efficiently than a round head reaming tool than you can imagine WIDELY APPLICATION: Air conditioning installation, open copper tube, so that two copper tube mutual link.(To be installed on hand electric drill) Colour:black Material:steel Package Contents: 1 x 5 in 1 HVAC Tools Copper Pipe Expander (3/4inch, 5/8inch, 1/2inch, 3/8inch and 1/4inch) 6 x Tube Expanders (7/8inch, 3/4inch, 5/8inch, 1/2inch, 3/8inch, 1/4inch)