To create perfectly expanded tubing for soldering or brazing,you must use soft ... inside of tube.2. To create perfectly expanded tubing for soldering or brazing,you must use soft copper or ... operated, single-stage expander is designed to expand robing for fast,accurate joints in soft copper,aluminium,and soft ... segments are made from high-quality hardened steel.4. For Metric:10,12,16,19,22,25,28mm O. ...