I think some idiot put the copper plumbing lines for the house in the 5/8 inch refrigerant line. Anyway, the line broke next to the plate and I had to pull it out to put 1/2" copper in it and skip the rest. Lines right. I had very little space and the large tools used with a hammer, didn't fit. It worked great and got me out of a tight spot. I only used one size and will probably (hopefully) never need it again, but it did the job effectively in seconds.