Zero Tolerance knives are a brand of Kai USA Ltd. The ZT brand first made its 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 in the military and law enforcement, as well as other first responders, such as firefighters and emergency medical personnel.

The brand quickly built a small, but dedicated fanbase, including those who weren’t first responders or military members. Whatever walk of life they came from, ZT owners fell in love with the hard-use designs and premium materials. They called the knives “real beasts” and “proudly overbuilt.”

Zero Tolerance knives have since expanded. The creation of multiple award-winning designs, such as the 0350 and the 0777, have earned the brand a place among the toughest of American-made knives. These designs, along with constant new innovation, have made Zero Tolerance into the brand it is today.