... service life PEX CRIMP TOOLS Application:1. Crimping the copper ring with PEXCaliber:dia. 1/4",3/8",1/2",3/4",1",1 1/4", 1 1/2 ... for head ;raw iron for handle .The hardness of head between 38-43 degree.MOQ:100PCS crimp tools for PEX tube sizing 1/4 ... ",3/8",1/2",3/4",1",1 1/4", 1 1/2 ...