Used on patriot. 2b thread class right-hand 0.990" overall width 20 thread quantity per inch adapter, cable to connectors (rfi) material: adapter components material-aluminum alloy per qq-a-225 or qq-a-591; hardware per an 50-C02-3. finish: cadmium plate, olive drab per qq-p-416, type ii, class 3 over electroless nickel per mil-c-26074, class 3 or 4, grade b. part description: adapter, cable to connector category 3c per mil-c-85049, for attachment to mil-c-38999 series i cadmium surface treated angle type w/clamp unef thread series