Uniweld 70005 Swage Punch Kit with 5 Separate Swage Punches 5 separate swage punches for 1/4in, 5/16in, 3/8in, 1/2in, 5/8in O.D. all kept in a vinyl pouch Designed to enlarge one end of copper tubing to make a connection without a fitting Swaging method means one solder joint, not two, so it will take half the soldering or brazing time that fittings require