Steel, protective finish mil-c-16232, type 1, 4.832 in. Plus0.000 minus 0.005 lg, 1.7500 in. Plus 0.0005 minus 0.0000 id, 2.062in. Od, 2.4995 in. Plus 0.0000 minus 0.0003 largest od, 4 holes0.312 in. Plus 0.001 minus 0.000 dia, 4 notches 0.250 in. W equallyspaced both ends