Matl aluminum alloy, ams4260, 356-t6; finish chem film; 1.380 in. Min lg, 1.430 in. Max lg, 0.610 in. Min w, 0.630 in. Max w, 0.358 in. Min thk, 0.368 in. Max thk; one 0.406 in. Diameter hole through irregularly spaced; two 2-56 unc-3b holes through irregularly spaced