Aluminum alloy qq-a-367 comp 7075cond t73, anodize mil-a-8625 cl 2 type 1, 4.650 in. Od, 3.265 in. Min to 3.270 in. Max id, 1.175 in. H, 4.125-16 unj-3a thd 0.665 in. Lg, 4 slots equally spaced 0.310 in. W 0.215in. Min to 0.230 in. Max dp, 1 internal groove 0.124 in. W 0.292 in. Dp