0.950 in. Diameter w/2 0.067 in. Diameter bolt holes spaced opposite ea other on a 0.844 in. Bolt circle dia, and 0.156 in. Diameter through hole on 0.500 in. Diameter bolt circle diameter located on centerline between bolt holes; 2024-t3 alum 0.008 in. Thk; black anodize per mil-a-8625 type ii