Idea-sided tool used to tighten and loosens crews with a matching hexagonal shape.
A hex key, also commonly called an Allen wrench, is an L-shaped hand tool designed to tighten and loosen fasteners with hexagonal-shaped sockets, essentially screws or bolts with a six-sided recess; it's a versatile tool used in a wide range of applications due to its ability to access tight spaces and provide a secure grip on the fastener.