The extra metal near the hilt on some double-edged knives serves as a guard, also known as a finger guard or quillon. The primary purpose of the guard is to provide protection for the user's hand during knife handling and use. It acts as a barrier between the hand and the blade, preventing the user's fingers from slipping onto the sharp edge while performing cutting or stabbing motions.
The guard is typically a widened portion of the blade, situated between the blade and the handle. Its design can vary widely, ranging from a simple, straight extension of the blade to more elaborate and decorative shapes. In addition to its protective function, guards can also add balance to the knife and enhance its aesthetics.
Guards are particularly common in combat and fighting knives, where they play a critical role in ensuring the user's safety during intense and fast-paced maneuvers. However, they can also be found on some utility and survival knives, depending on the intended use and design of the knife.