heavy duty stainless steel and copper materials, and sturdy, to use.swaging tool Manual copper tube expander can be use to expand copper pipe with diameter 6.5mm, 8mm, 9.5mm, 12.7mm, 16mm, 19mm (1 / 4 " 5 / 16 " 3 / 8 " 1 / 2 " 5 / 8 " 3 / 4 Widely used in the maintenance of refrigerators, air conditioners, freezers and other refrigeration equipments Greatly improve the accuracy, save-time and for and light, spring design, make work more effort, Manufacturer: Kelisdi