【PRACTICAL】Maintain the ductility of the copper pipe during the expansion process to avoid cracks and leaks 【APPLICATION】Mainly used for extending copper pipes to firmly connect two copper pipes when installing an air conditioner. 【MATERIAL】 Made of bearing steel with high yield strength and resistance to contact fatigue, it is not easily deformed after long-term use. 【HEXAGONAL HANDLE DESIGN】 It will not fall off easily when attached to a hand tool, and the operation is safer. 【Compatible】There are a total of 6 different sizes of expanders, suitable for expanding different diameters of air conditioning copper pipes. Hexagonal handle design:: 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 strength yield strength and resistance to contact fatigue, it is not easy to deform after long-term use. Strong compatibility:: There are a total of 6 different sizes of expanders, suitable for expanding