... tube: 1.we are factory 2.OEM service 3.sound quality 4.accurate size and long service life PEX CRIMP TOOLS Application ... :1. Crimping the copper ring with PEXCaliber:dia. 1/4",3/8",1/2",3 ... :100PCS crimp tools for PEX tube sizing 1/4",3/8",1/2",3/4",1",1 1/4", 1 1/2", 2 ...