GRADE RINGS

 18" ID Diameter

2"

3" 

4"

6" 

30" ID Diameter

2"

3"

4" 

6"

8"

12"

40" ID Diamter

4"

6"

Cast Iron Grade Rings

Heights

1"

1 1/4"

1 1/2"

2"

3"

4"

5"