Material aluminum alloy 2024-t351, finish chemical film mil-c-5541 cl a, lg 1.380 in. Nom, width 0.410 in. Nom, stock 0.190 in. Nom, 2-56 unc-2b 2 places 0.562 center to center along lg, 1/4-28 unf-2b csink 90 degrees to 0.35 diameter /both sides 4 places/, cut out of 0.630 in. Shaped like letter u