Aluminum sheet or bar, 6061-t6 per qq-a-250/11 or qq-a-225/8, anodized, o/a dim. 2.880 in. Lg, 0.500 in. W, 0.125 in. Thk, w/two 0.125 in. By 0.310 in. Slotted holes spaced 2.375 in. C to c, w/cutout located on bottom edge at center 0.120 in. Deep on 0.750 in. Radius