HIGH QUALITY MATERIAL: Bearing steel material, with high and uniform hardness and wear resistance, high elastic limit, is a good helper for your work and life. NOT EASY to FALL: The standard hex handle is not easy to fall off when installed on tools such as power drills. It has perfect depth and a tight fit, which will make brazing easier and reduce fatigue stress in the mating area. GOOD DUCTILITY: It can maintain good ductility during the expansion process, which can prevent the copper pipe from cracking and leaking. The full line of forging tools can easily extend the HVAC pipe, and the forged plug will provide a great depth of exchange to achieve a perfect fit. VARIOUS SIZES: 6 sizes of expanders are included, which are suitable for the expansion of different air conditioning copper pipes to meet your needs. PURPOSE: This pipe expander is mainly used to widen copper pipes when installing air conditioners, and to connect two copper pipes tightly; it is great for installers whether you are just learning it or already doing it, whatever. How to use : When installing the air conditioner, expand the copper pipes so that the two copper pipes are connected to each other. (Must be installed on a hand-held electric drill) Specification : Item type: tube expander Material: bearing steel Surface treatment: blackening Specifications: 7/8 inch (about 22.2mm / 0.9 inch), 3/4 inch (about 19mm / 0.75 inch), 5/8 inch (about 15.9mm / 0.6 inch) , 1/2 inch (about 12.7mm / 0.5 inch) inch), 3/8 inch (about 9.5mm / 0.4 inch), 1/4 inch (about 6.3mm / 0, 25 inches) Package list: 6 x tube expanders