Designed by Spyderco founder Sal Glesser and inspired by the groundbreaking innovations of French knifemaker Fred Perrin, the Swick is a purpose-designed personal-defense tool. Its most distinctive feature is a Perrin-inspired index-finger hole that locks the knife into the user's hand for superior grip security. Sized for a man's hand, the 1.03-inch-diameter (26.1mm) hole is flanked by a full-flat-ground Wharncliffe blade and a full-tang, pistol-grip-style handle. Concealed internal pins secure a pair of peel-ply-textured scales to the handle, and a strategically placed section of jimping (textured grooves) on the spine provides a non-slip thumb ramp.