Zero Tolerance Knives are manufactured by Kershaw Knives and were first introduced into the market in 2006. The beginnings were geared toward military, law enforcement, and other first responders. They made a name for themselves as tough and dependable knives. As time went on, they started making knives that were suitable for every day carry. ZT Knives are constructed with top of the line materials such as S30V or ELMAX blade steel, and G-10, titanium and carbon-fiber handle scales. Shop our selection of ZT knives and get yours today.