There are a real good trap. Four of us including the guy that makes them have gone out with them the last two springs rat trapping and he caught 750 rats in three weeks two years ago and 350 rats in two weeks last year with them. They are design to allow the young/smalls rats to get out between the bars and hold only the bigger ones. If you set them out in spring and the young get away, wait for thirty days and you'll have that rats again when its a little bigger in size which turns into a dollar more.
I have a couple of them and would recommend them to anyone that has a area with a lot of rats. You'll clean up the area in no time. But on the other hand owning these traps; they are so good and effective that you could clean out/ over harvest an area of rats too.
Get a couple you won't regret it, its just another tool that you will put to use.
JC :hello: