The 11 in 1 Screwdriver includes the 8 bits and 3 nut drivers most requested by professionals. The bit prevents bit wear from hardened screws and extends bit life when fastening specialty screws found in electrical boxes, conduit couplers, outlets, and other common job site fixtures.  Contains: Phillips #1, Phillips #2, slotted 3/16", slotted 1/4", square #1, square #2, ECX^™#1, ECX^™ #2, 1/4" nut driver, 3/8" nut driver and loop maker.