Product Description: 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. dia 0.03 in. deep counterbore on narrow flanged side, 0.495 in. dia 0.156 in. deep counterbore on wide flanged side, 0.1 in. wide 0.918 in. dia groove in od, 0.06 in. w flange one side 0.091 in. w flange on other side