Sometimes, until you actually go looking for a specific item, you have no idea how many variations there are. Knives are an item that falls into that category. There are thousands of types of knives when you look for them, and picking out survival knives is more complicated now than ever before.
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Three of the main types of knives are automatic, spring assisted and butterfly. Automatic knives open with the touch of a button and can open from the front or side. Many states have laws that pertain to owning this kind of knife, so although very fun to own, make sure you know your local laws before buying one.
Spring assisted knives are knives that you open with your own power by pushing a button that releases it and then pulling it out on your own. A good example is a pocket knife. These knives are legal in most areas, but again, check your local laws first. Finally, the butterfly Survival Knife. These are the knives that you see in the movies and they are very fun to own. They take some training, but once you learn how to use them, you can become very skilled with them.
One of the most popular survival knives is a spring assisted knife called the Knives Extreme Survival Assisted Opener, Serrated Black. Serrated simply means that is has many sharp spikes coming off the blade. This particular survival knife is partially serrated with a 3 3/8" blade. The knife as a whole measures 4 1/2" when closed. It also has a pocket clip and thumbside safety.
Although this is one of the most popular kinds of survival knives, there are many factors that go into choosing the best survival knife for you. Many people may think that the huge Rambo type knives they see in movies are the best kind for survival, but they are not. Those knives are impractical. A good thing to think about when buying a survival knife is the bulk and weight of a knife. A survival knife is something you will keep with you most of the time so it can't be too heavy or bulky.
Also, the blade should be between four to six inches long because anything bigger than that is often very hard to control. The blade thickness should be between 5/32 and 8/32 of an inch. Any blade that is thinner than that is too flexible to accomplish much and blades thicker than that lack the finesse that survival knives are often called upon for.