All caps are die stamped from 11 gauge (1/8") cold-rolled steel. They are available in the following sizes:

1 1/4 inch
4 1/2 inch
1 1/2 inch
5 inch
1.66 inch
5 1/2 inch
1 7/8 inch
6 inch
2 3/8 inch
6 5/8 inch
2 7/8 inch
8 inch
3 1/2 inch
8 5/8 inch
4 inch
5 in. Square