8 Piece Jumbo Combination Wrench Set (33 mm - 50 mm) Box End Design Provides Clearance for Your Knuckles, Box End Incorporates a Radius Corner Design That En+K45gages the Flats of the Fastener (Not the Corners), Providing 15% to 20% More Torque, Open End is Offset 15° for Greater Access and Designed with a Continuous Curve That Distributes Stress.