Primitive knives made of stone are perhaps the earliest implements and weapons that humans used. Knives are a very basic, but very critical, important, versatile and useful part of your survival kit. Knives come in many different shapes, sizes and materials. This article will give you the knowledge you need to know in order to make smart knife purchasing choices.Primitive knives made of stone are perhaps the earliest implements and weapons that humans used. Knives are a very basic, but very critical, important, versatile and useful part of your survival kit. Knives come in many different shapes, sizes and materials. This article will give you the knowledge you need to know in order to make smart knife purchasing choices.