C/o aluminum alloy 6061-t6, qq-a-325, block 3.750 in. Lg, 0.750 in. W, 1.172 in. H, 2 holes 0.281 in. Diameter through 1.172 in. Way, 1.375 in. Each side of center, 1.000 in. Radius arch machined to 0.219 in. From bottom on center, front vertical corners beveled 45 degrees 0.125 in. Deep, 125 uin finish