SK Hand Tool 89441 11/16" x 3/4" Stubby Flexible Double Box Universal Spline Fractional G-Pro Wrench Works on various types of fasterners, spline, 6 point, 12 point, 50% rounded, torx and square Patented 90 teeth design 11 degree effective swing arc Non-slip feature on the open end can be used on damaged fasteners that are up to 70% rounded.