4aluminum alloy material; 2.000 in. O/a lg, 1.196 in. Dia, 1.118 in. Diameter bore w/one groove 0.355 in. W 1.408 in. Diameter located 0.532 in. End to groove c, one groove 0.210 in. W 0.110 in. Depth 1.776 in. Diameter on outer periphary 0.605 in. End to groove c