Cold Steel push knives: 

Cold Steel has been making push knifes for a quarter century. In those twenty five years we have continually been refining our designs, discarding features that didn’t perform as well as we would have liked and enhancing those that did. These blades, and the wealth of experience that has gone into their manufacture, have paid off handsomely for Cold Steel as they have generated quite a following among law enforcement and military personnel around the world. This is because they offer “big knife” cutting and piercing potential in a very compact, easily portable size.