Spec mil-f-13926 and ansi y14.5- 1973 apply. Material: aluminum allo y,7075 or 6061,temper t6,spec qq-a -200/11 or qq-a-225/8. All surfaces 125 micro-inches except as noted. Pr otective finish: except .500-13 tapp ed hole finish 7.2.1 of mil-std-171. Area marked "x" finish 20.24.1 of mil -std-171,color green 383.