Allen Key in L-shape with a tip size of 1. Ideal for all types of use by professional mechanics, plumbers, carpenters, and electricians, as well as for household use. Allen keys are made from a single piece of hexagonal rod of hardened steel with blunt ends that fit comfortably into similarly shaped screw sockets. It is bent at 90 degrees, forming two arms of unequal length that resemble the Latin letter "L".