I have a few of the stamped excluder's that someone gave me. The edges of the stamped holes are very sharp. I would think that they will damage your bees. The few cloake boards that I have are made out of round wire or plastic. Try Brushy Mountain for the plastic excluder cloake board.
I looked at the Brushy Mtn. cloake board but I'm trying to save a few dollars this year by making my own equipment. I figured that the stamped excluders would be thin enough to fit in a single pass saw blade kerf. I have a few wooden bound wire excluders from Rossman. They appear to be double the thickness I would expect the stamped type to be and might require a second pass with the saw.
They were handy for some things, but hard on the bees' wings. For small applications I usually use #5 hardware cloth. For larger things like a cloake board, I use the wire ones.
I plan to use a wire wheel to smooth the sharp edges. Michael I have not seen the #5 hardware cloth. I caught the devil finding #6 mesh for my SHB traps and it cost me about $600 for a 100ft roll. Sounds like #5 could be used in lieu of an excluder.