Hydraulic Hose Crimper Manual A/C Hose Crimping Tool Kit Die Sizes #6 #8 #10 #12Hydraulic crimping tools are specialty, professional pliers designed for the crimping of copper, aluminum, various metals, as well as types of cable wiring and butt connectors. Crimping pliers will crush metal objects to create what is called a crimp, which describes a tight join or closure that will not open back up on its own. Features: Easily Crimp Barbed and Beaded Fittings with this Hydraulic A C Hose Crimper. Includes Complete Set of Die