Consists of black anodized aluminum per mil-a-8625, type 11, class 2; dims 1.420 in. Outside dia; 0.906 in. Inside dia; 0.375 in. Thick; 96 dp diamond knurl; threaded 0.127 in. From bottom with 32 uns-2a threads with major diameter from 1.374 in. To 1.368 in. And min diameter 1.335 in.