Industrial quality tool set of special chrome-molybdenum-silicon-manganese- vanadium steel alloy. Sizes and shapes as described above. Including screwdriver with positive spring-sleeve holder for bits. Magnetic holder for work with electric screwdriver or drill. Adapter with male square and male hex drive and matching attachment with female square and female hex drive. Special attachment for centrically clamping screw hooks and similar parts. All in sturdy steel box with durable powder coated finish. Each part clearly marked and of fixed location.