SK Hand Tools 89250 5 Piece Fractional XXL Double Box Spline G-Pro Wrench Set 1/4 x 5/16, 11/32 x 3/8, 7/16 x 1/2, 9/16 x 5/8, 11/16 x 3/4 Double Box XXL Spline G-Pro Wrenches. Packaged in a molded plastic case. 90 teeth design delivers 4 degree effective swing arc Added reach for better access. 0-degree offset. Works on all types of fasterners, spline,6 point,12 point,50% rounded,torx and square Packaged in a molded plastic case