A fifty-piece module with 3/8 inch drive combines socket heads and screwdriver bits for service and assembly work. It includes twelve-point sockets in sizes 8 to 22 mm, extended hex sockets and bits for flat, hex, cross PH and PZ, and star screws. Also included are a ratchet with a reversing lever, a universal joint, and an extension of 125 mm in length. A moulded insert holds the individual pieces in their designated places and makes selection easier during work.