Why Switchblades are automatic or one-hand opening knives?
There are many manufacturers that make these knives such as: Gerber, Smith & Wesson, Buck, Schrade, and Boker to name a few. Most are side opening, but there are also OTF (Out The Front) knives. An OTF is a knife that the blade deploys straight out of the top of the handle. Know more at https://www.myswitchblade.com