Matl 0.020 in.Thk al alloy sheet tem t6 per qq-a-250/11; finish sulfuric acid anodize per mil-a-8625 type ii class 2 color no 37038 per fed-std-595, light diffusing polyester coating per f-190 0.0015 in. Thk; o/a dim. 5.74 in. X 5.50 in. X 0.65 in.; 1 hole 2.87 in. Diam