The M16-12Z and M16-12ZLEK uses our very successful InterFrame construction, tough, textured glass filled nylon scales over a 420J2 stainless steel liner InterFrame. We overbuild it for rigidity, using solid glass filled nylon back spacers. And we assemble the handle with superior offset Torx® fasteners. The handle is exceptionally rigid and fills the hand perfectly. Automated Liner Safety Triple Point™ Serrations Glass-Reinforced Nylon Handles Seat Belt Strap Cutter and Tungsten Carbide Window Breaker