Delivering up to 62 percent more turning power than conventional open-end wrenches, the Snap-on 10-Piece Combo Wrench Set, No. SOEXM710, features the Flank DrivePlus design - a series of flutes or notches that “bite” into the fastener for additional flat-to-flat contact, preventing slipping and rounding of the fastener. Additionally, the box end is rotated 7.5 degrees away from the handle so the wrench can be flipped to get a new grip in tight situations. Manufactured with special alloy steel, precision-forged and heat-treated for durability, the SOEXM710 is perfect for tough jobs and hard-to-reach areas. The set includes part numbers SOEXM10 through SOEXM19, sizes 10mm to 19mm, and a storage tray.