The Fuhr Long Series Allen Key in 3/16" (4.76 mm) is manufactured from special tempered and hardened steel with a black finish for durability and corrosion resistance. This imperial-sized hex key is ideal for accessing recessed hexagonal socket fasteners in machinery, electrical equipment, and general assembly work. The extended length design provides improved leverage and reach in confined spaces, making it a reliable choice for electricians, engineers, and maintenance technicians.