The JEMLINE 331ZL is similar to the Model 331 except it features the Z-Lock reverse safety notch. Application of the Z-Lock handle punches a safety notch into the strapping that prevents movement of the crimped join and virtually eliminates the possibility of the crimped joint pushing apart when not under tension. The tool handles 3/4"(19mm) from .025"(.64mm) to .031"(.80mm) Hi Tensile strapping.
You must state size of strapping used so that tool can be set up for correct width and gauge. 
JEM Strapping Systems is capable of providing you with all of your strapping & packaging needs. Whether you are in need of Strapping, Stretch Film, Angleboards, Tools, or Repair, JEM Strapping Systems can meet those needs. Check out our Products page for more information on the products and services we offer.