I had a frozen 15mm nut on my Jeep's suspension that I had to split to remove the strut connection. I used a larger splitter and deformed the cutting edge of the splitter instead of cutting into the nut to split it. It's been a few years, but I've used nut splitters many times when I was wrenching for a living, so I know how to use them. . I ended up hanging both fragments in my shop as a reminder of the Wall of Shame. I think I'll just throw in some Dremel cutting discs. It seems to be working better.