PXCR andPEXOH PEX Crimpers squeeze the copper rings used on PEX brass fittings.PEX systems are used for potable water lines,radiant heat,snow melt and ice rink systems,among other applications.The design of these PEX crimpers eliminates tool marks and distortion on the rings.The tools crimp rings easily,making PEX installation a breeze.For one-hand use on 1/2and 3/4PEX,consider the PEXOH12or PEXOH12or PEXOH34..The close quarters PEXSD model utilizes a screw drive for crimping .It features four sizes in its compact shape.Each crimper for copper rings comes with its own go-on-go gauge .