Stiletto some employed a telescoping blade. These Italian switchblades were commonly and popularly referred to as stilettos, since most incorporated a long, slender blade tapering to a needle-like point, together with a slim-profile handle and vestigial cross-guard. The majority of these Italian stiletto switchblade knives used a now-iconic bayonet-style blade with a single sabre-grind edge (often unsharpened) and a long opposing false edge. As with the medieval stiletto, the stiletto switchblade was designed primarily as an offensive weapon, optimized for thrusting rather than cutting. Most of these knives were designed with a locking device which locked the blade in the open
Stiletto fallen or severely wounded heavily armored opponent. The needle-like blade could, if used with sufficient force, penetrate most mail or find its way through gaps in a knight's plate armor, and was narrow enough to pass through the eye slits of the helmeted knight. A severely wounded opponent who was not expected to survive would be given a "mercy strike" (French "coup de grâce"), hence the name "miséricorde". Later, the Gunner's Stiletto became a tool for clearing cannon-fuse touch holes; used in the manner of an automotive oil dipstick, they were often inscribed with marks indicating levels of powder charges