6item has outside diameter of 5.400 in., inside diameter of 4.285 in., width of 1.50 in., bolt circle diameter of 5.125 in., has 8 mounting holes 0.139 in. Min, 0.144 in. Max dia, equally spaced; matt al alloy 2024-t4 per qq-a-355; finish anodize per mil-a-8625 type 1