It's hard to get a sense of scale. It's a rat trap, same difference I guess, just a bit bigger. It's got a mighty spring in it so it sets off the primers well. I screwed a bit of flat steel under it so it doesn't move about or fly to bits from the primers igniting.
I'm busting to try it out in a real situation. GF's renovation house got broken into and cost money for two complete windows and a door
so I wish I'd thought of it sooner.