Provides 15% more torque than standard sockets with exclusive Max-Drive(TM) radius-corner design ; Tightens fasteners easily ; Simplifies the turning of rounded corners ; Helps reduce fastener wear without contact with the outer 5% of the fastener ; Includes 1/4" drive T8, T10, T15, T20, T25, T27 bits & 3/8" drive T30, T40, T45, T50, T55 bits;