Matl aluminum alloy, qq-a-591; o/a dim. 3.005 in. Lg, 1.270 to 1.290 in. W; 2 holes 0.144 to 0.150 in. Dia, 4 holes 0.0937 to 0.0997 in. Diameter thru, 2 holes 0.062 in. Diameter thru, 1 hole 0.070 to 0.076 in. Diameter thru, 1 hole 0.1406 to 0.1456 in. Dia