Channellock 38053 Uni-Fit 4-In-1 Ratcheting Wrenches, 2-Piece Uni-Fit box ends drive SAE, Metric, External Torx, Spline, Square, 6-Point and 12-Point Fasteners plus Rounded Hex (4) double sided reversing box ends drive 34 sizes and styles of fasteners 72 gear teeth box ends need only 5-Degree to turn a fastener SAE sizes: 5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4-Inch Metric Sizes: 8, 10, 11, 13, 14, 16, 17, 19mm