6o/a h 1.360 to 1.370 in.; o/a lg 1.430 to 1.450 in.; o/a w 1.660 to 1.680 in.; 4 mtg holes 0.213 in.; external thd 0.375-24 unf 3a shank; id 0.234 in. To dp 0.660 in. Counterbore 0.280 to 0.282 in diameter to dp of 0.410 to 0.415 in.; matl al alloy; anodized