The smallest two are 5/16 x 7/16 and 7/16x 1/2.
If you read the AA info, they tell about the forged-in codes that were supplied in sets.
The wrench sizes (listed box end first) are 5/16x7/16, 7/16x1/2, 1/2x9/16, 9/16x5/8, 5/8x3/4, and 3/4x7/8.
The overall length of the set is 7.4 inches. The individual wrench lengths are 4.0, 4.5, 5.1, 5.9, 6.6, and 7.4 inches.
The finish is cadmium plating.
In addition to the markings noted above, each of the wrenches is marked with a forged-in code, and four of the six wrenches also have a "Pat. Pend." patent notation. The individual codes and patent markings are, from smallest to largest, 4X (Pend), 4.5U, 5S (Pend), 6.T, 6.5T (Pend), and 7.5U (Pend).