6aluminum alloy, qq-b-613, alloy 260, cond 1/2 h; tin lead plate, mil-p-81728; 3.030 in. O/a lg; 1.000 in. O/a w; 2.410 in. Between legs; two 0.143 in. Min, 0.149 in. Max diameter mtg holes located 2.670 in. C to c with two 0.138-32 unc 2b tapped plate nuts