Automatic Knives, also referred to as switchblades, open automatically with the press of a button or pull of a lever. Shop our large variety of Out the Side Automatic Knives at DNK Knives. The quick release of the blade makes these knife types popular amongst military, police and EMT duty. The design makes this knife ideal for emergency situations. Also check out our Out the Front Automatic Knives. Automatic knives are restricted in numerous areas, so make sure to check your state’s knife laws before purchasing.