The only screwdriver with the patented ECX bit and hardened tips, the Milwaukee 11 n 1 screwdriver includes the 6 bits and 3 nut drivers most requested by professionals with the added utility of a wire stripper and wire bending hole. The Milwaukee ECX bit allows users to extend the life of their bits when fastening specialty screws found in electrical boxes, conduit couplers, outlets, and other common job site fixtures. The patented geometry gives the ECX bit this advantage over traditional Phillips or square bits.