PRACTICAL Maintain the ductility of the copper pipe during the expansion process to prevent cracking and leaking. APPLICATION Mainly used to expand copper pipes, to make two pipes copper wires tightly connected when installing air conditioning. MATERIAL Made of bearing steel, with high yield strength and resistance to contact fatigue, it is not easy to break deform after long-term use. HEXAGONAL HANDLE DESIGNIt is not easy to fall when installed on a hand tool, and the operation is safer. FITSThere are a total of 6 different sizes of expanders, suitable for expanding different diameters of air conditioning copper pipes. Specifications: 7/8 inch (approx. 22.2mm/0.9in), 3/4in (approx. 19mm/0.75in), 5/8in (approx. 15.9mm/0.6in), 1 /2 inch (approximately 12.7 mm/0.5 inch), 3/8 inch (approximately 9.5 mm/0.4 inch), 1/4 inch (approximately 6.3 mm/0.25 inch )