Men's Effects offers high-quality automatic knives and stiletto switchblades online from Boker, Smith & Wesson, Famars, + more. Free shipping on auto knives. Automatic knives switchblades are one type of knife coming with folding or sliding features securely contained in the handle. The handle contains a switch or button or lever which is further connected to a spring that enables the blade to come up automatically when pressed. For details visit https://www.menseffects.com/.