Exclusive with Xcelite, 1/4" and 5/16" magnetic fixed handle nutdrivers offer the ultimate in convenience for assembly and service operations involving hex fasteners. The Alnico permanent magnet inserted in socket holds fasteners firmly for easy, one hand driving or for retrieving on removal. A unique Xcelite development effectively insulates magnet. All nut driver sockets have been specially treated and hardened for use with self-tapping screws. Comfortable contoured handle provides adequate torque for one-hand driving.