Automatic knives are sliding or pivoting blade contained in the handle that extends automatically by a spring when a button, lever, or switch on the handle or bolster is activated. These switchblade knives also known as the pushbutton knife, a switch knife, automatic knife, ejector knife, flick knife, Stiletto, flick blade, or spring knife. A locking blade is a feature that almost all switchblades have, protecting the blade against accidental closure while in the open position. A mechanism that enables the blade to be folded and locked makes it useful in fighting and survival positions. Tom Cruise himself used such knife in 2004 Michael Mann film Collateral. John wick is also found of using this gadget.