Item is electromagnetic; has id of 0.729 in. Min, 0.759 in. Max; is 1.000 in. Min, 1.120 in. Max lg; has an overlap of 0.250 in. Min, 0.500 in. Max; matl nickel-iron aly per mil-n-14411 comp 1, 0.012 in. Min, 0.016 in. Max thk; heat treat anneal per sc1060