5matl aluminum per qq-a-250/8 5052-h32, chem film per mil-c-5541 cl 1, 0.090 in. Thk, o/a length 2.500 in., o/a width 2.000 in. 2 mtg holes 0.158 in. Min and 0.164 in. Max, first aperature 0.375 in. Dia, second aperature 0.480 in. Min and 0.489 in. Max