Matl, brass qq-b-639, o/a, 3.375 in. Lg o/a; 2.000 in. Across hex flats; 3 female 0.500-20 unjf thd holes ea end, 3b; 2 female 0.562-18 unjf thd holes ea end, 3b; 4 holes thd 0.250-20 by 0.500 in. Dp for mtg, 2b; 1 hole 0.562-18 unjf special placement-port class 2b