STANLEY 89-420 11-Piece 1/4" & 3/8" Professional Grade Star-Style Bit Set

• 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;