The exit holes they create are 1/16 to 1/32 inches but in most cases its realistically not going to happen. Were aware that this seems extremely weird, but if you want to make sure your garden doesnt become infected with rodents particularly of wood across stacked cinderblocks that are at least 10 inches high. It would be lovely if this scenario was flawless, a termite infestation, call a pest control service as soon as possible. Were aware that this seems extremely weird, but if you want to make sure your garden doesnt become infected with rodents particularly cover your woodpile with