X-Frame’s revolutionary design is exclusive to SK tools. SAE – The X-Frame® Fractional Combination Wrench Set in chrome by SK Tools delivers the best wrenches for maximum power and precision in tight spaces. Set Includes: 3/8″, 7/16″, 1/2″, 9/16″, 5/8″, 11/16″ and 3/4. Industry’s lowest 1.7 degree arc swing for maximum precision and power in the tightest spaces with 216 positions. Revolutionary 6 pawl technology that works in pairs, so one pair is always engaged. I-Beam handle distributes added force evenly for superior strength and durability. SureGrip® design drives the sides of the fasteners for maximum strength and minimum rounding. High performance tools built to last a lifetime.