Nickel, rockwell c scale 58 to 62 hardness, 6.000 in. Od, 5.375 in. Id, 3.013 in. Lg, 1 end, internal flange, 4.314 in. Dia, 0.200 in. Thk, other end, internal and external flange, 5.165 in. Id, 6.250 in. Od, internal flange 0.125 in. Thk, external flange 0.250 in. Thk