Stiletto designed the Fairbairn–Sykes fighting knife, a double-edged dagger with a long narrow point designed to optimize the blade for thrusting, though it was also capable of slashing strokes if the cutting edges were sharpened. Other variations of the F-S knife soon emerged, including the U.S. Marine Raider Stiletto, which was based upon the Fairbairn-Sykes knife, and the U.S. V-42 stiletto, designed from the outset to emphasize thrusting over cutting. During the 1950s, large numbers of folding switchblade or automatic opening knives with locking blades were imported from Italy to the United States. Most of these switchblades were side-opening designs, though
Stiletto heel popularity in the 1950s, they reached their most refined shape in the early 1960s, when the toes of the shoes which bore them became as slender and elongated as the stiletto heels themselves. As a result of the overall sharpness of outline, it was customary for women to refer to the whole shoe as a "stiletto", not just the heel, via synecdoche ("pars pro toto"). Although they officially faded from the scene after the Beatle era began, their popularity continued at street level, and women stubbornly refused to give them up even after they could no longer readily find them