The Zero Tolerance brand, also called ZT, first made an appearance in 2006 when they saw a place in the market for a Made-in-USA line of hard-use knives that would meet the needs of professionals and first responders. Since that time, the line has expanded to include a variety of general use and premium knives. From larger and heavier outdoor knives to slimmer and lighter everyday carrying knives that are built to the highest performance standards, Zero Tolerance knives always provide knife owners with top-of-the-line quality. ZT is a division of Kai USA, built tough right here in the USA from premium materials such as S30V, S35VN, or 20CV blade steel and G10, titanium, and carbon-fiber handle scales. ZT's fit, finish and smooth operation are second to none.