Steel casting, spec qq-s-681, class 65-35 or 70-36 or carbon steel, 1015 to 1025, qq-s-631; nickel plated 0.0015 to 0.0025 thk, mil-c-26074, class 2; 2.190 in. Lg; 0.150 in. W; 0.188 in. Thk; two slots 0.062 in. Lg by 0.437 in. Wide; slots used for mtg; 0.125 in. From end of slots to end of cam