Reduced Open-End Diameter for increased access XL Beam Design is up to 25% longer for improved reach and leverage 120 Positions give a 3 degree swing arc for improved access Reduced Ratcheting Box-End Diameter for increased access Highly visible, recessed color size markings on each end, blue for metric and red for SAE Universal Spline Drive works on 5 common fasteners - 12-point, 6-point, rounded 6-point, Spline, E-Torx and Square Sizes 7/32", 1/4", 9/32", 5/16", 11/32", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1"