I mamufactuer 4 small internal combustion engines. Thay range in bore size from 1.000 inch to 1.500 inch in diamiter. I make my rings now it takes too much time. What I use now i1.000 od wall thiknes is .050 higth is.050 .ring wall pressure calculates to about 10 pounds per square inch. Whitch works very well so fare. Thank You .