Aluminum 2024-t4, chromate dip sp-870, 1.02 in. min 1.022 in. max od, 0.249 in. min 0.251 in. max w, 0.382 in. min 0.384 in. max id, 0.75 in. diameter 0.03 in. deep counter bore on narrow flanged side, 0.495 in. diameter 0.156 in. deep counter bore on wide flanged side, 0.1 in. wide 0.918 in. diameter groove in od, 0.06 in. with flange one side 0.091 in. w flange on other side