Material aluminum alloy 6061/t6 per qq-a-200/8; captive nut, case hardened steel; finish chemical film per mil-c-5541; captuve nut finish cadmium okate oer qq-p-416, type 2; 0.500 in. length; 0.250 in. H; 0.225 in. W; captive nut in one end 0.112-40 unc-2bn