【PRACTICAL】Maintain the ductility of the copper pipe during the expansion process to prevent cracks and leaks 【APPLICATION】Mainly used for expanding copper pipes to firmly connect two copper pipes during air conditioner installation. 【MATERIAL】Made of bearing steel, with high elastic limit and contact fatigue resistance, it is not easy to deform after long-term use. 【HEXAGONAL HANDLE DESIGN】It is not easy to fall off when attached to a hand tool, and the operation is safer. 【Compatible】There are 6 different sizes of expanders in total, suitable for expanding different diameters of air conditioner copper pipes. Handle design Hexagonal: It is not easy to fall off when attached to a hand tool, and the operation is safer. Excellent Material: Made of bearing steel, with high elastic limit and contact fatigue resistance, it is not easy to deform after long-term use. Strong Compatibility: There are 6 different sizes of expanders in total, suitable for expanding different diameters of air