Made from 6061-t4 aluminum alloy per qq-a-250/11; finish f2.21; 2 holes 0.220 inch diameter; 1.310 inches wide; 2.50 inch long; 0.410 diameter inside hole; 0.499 inch, 0.500 inch outside hole; identify per wps 603; penetrant inspect per mil-i-6866, wps-903; break sharp edges; 0.156 bend radius