There are several types of automatic knives that people can use.  Usually, these options depend on how the knives’ blades are opening up.  One of these types is the side opening ones.  These are the knives that fold at the side part.  Once the lever is pressed, the blade will initiate from the side.  At the same time, keeping the blade would also need the user to push the blade on the side so they will lock it in place.  With this, they will secure the knife’s blade and keep them from being hurt while they bring them at the outdoors.  You can choose this type of blade if you prefer the side opening ones or other types.