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.) Made of high-quality carbon steel material, durable. After installing the air conditioner, unfold the copper pipe to interconnect the two copper pipes. It must be installed on a manual electric drill. Easy to Install: Perfect for installers, no matter if you are just learning or have been doing it. Height: about 45mm / 1.77in; 50mm / 1.97in; 55mm / 2.16in Colour: black Material: carbon steel Size: 7/8 (22.2mm), 3/4 (19mm), 5/8 (15.9mm), 1/2 (12.7mm), 3/8 (9.5mm), 1/4 (6.35mm) Package Contents: 6 x Copper pipe forging tool bit Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.