1aluminum, qq&a&256-6, alloy 2024&t4, and cres, ams5643, 17-4ph, 2.568 in. Min 2.569 in. Max dia, 1.070in. Min 1.110 in. Max h, 4 holes 0.116in. Min 0.121 in. Max dia, equally spaced on 1.500 in. Dia, 2 holes 0.157in. Min 0.158 in. Max diameter through 2 walls