This is for punching hollow leather? Ain't never heard of that.
No, just kidding, it's for punching normal leather! Put the punch on your leather and give it a big ol' whack with a hammer and it'll pop right through. Now, that's technology!
Comes with 1/8", 5/32", 3/16", 7/32", 1/4", and 5/16" punches.