I actually tried 4 different rods from Linen & Things before I found the ones that worked. These are the rods that are 2 inches from the wall when mounted. I only have my big punches on them as I have a ton of them and I used all of my wall space.
I did just check and the medium sized SU! punches also work fine (like the 3/4 inch square size, heart, etc) BUT the little punches (like the 1/4 inch circle punch) do not work. IF you have the wall space, the handheld punches will also hang on the rod but don't actually lean up against the wall.
HTH...love this idea and it was perfect for this little space of wall that I had left in my stamp room.
NOTE: I have also heard of people buying the cafe rods from WalMart to use. I looked at these but I liked the mounting system better on the rods I bought because it seemed more sturdy for the heavy punches. The price was not that much different either and you can always use the 20% off linen n things or bed bath and beyond coupons
Have fun