Steel, phosphate type 2, class 3 external surface only except threadedholes, 7.496 in. Min, 7.498 in. Max. Od, 5.500 in. Min, 5.502 in. Max. Id, 49.093 in. Min, 49.156 in. Max. Lg , 14 holes 6 in one end, 8 inother end, hole size 0.250unc-2b, 16 microinch finish on id