1material aluminum alloy 2024 t351, finish chemical film mil-c-5541 cl 1a, lg 1.000 in. Nom, width 0.410 in. Nom, stock 0.190 in. Nom, 2-56 unc-2b 2places 0.812 center to center along lg, 1/4-28 unf-2b csink 90 degrees to 0.350 diameter /both sides 4 places