1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5
Ductile Iron
6 to 7-1/2, 7-3/4 to 9, 9-1/4 to 12-1/2, 12-3/4 to 15-1/2, 15-3/4 to 19, 19-1/4 to 22, 22-1/2 to 26, 26-1/4 to 30
18, 29, 38, 53, 70, 89, 130