Inbusové kľúče a torx kľúče - S-tvar

Hex keys are known by many names including allen key, allen wrench, and L-key. A single key is an L shaped hexagonal rod, though some fold up sets have multiple-sized straight rods that are attached to a handle, resembling a multi-tooled knife. The hex keys are used to tighten and loosen socket-head bolts.