Product Review EverTough Nut Splitter 65126
I thought all those were basically the same.
Guess not.
The one I've had since the early 1990's has a spline down the inside to keep the chisel from rotating.
I bought it specifically to split nuts on axle U bolts and it's done that for decades.
Of course, the last time I needed it, I couldn't find it.
So I ordered a no name set of four different sizes from ebay.
I've only used the next to smallest one and it did "OK" but was at a tough angle to work in.