This is a harpoon trap. You set it just above the mole run and the mole sets it off as he tunnels just below the surface. Theoretically. In practice, this evil-looking device is useless. Which, much as I'd like to catch the critter that flattened our cauliflower, is a relief to me. Look at that thing. It has two sets of prongs on either side of it to erm..."harpoon" the mole when it sets the trap off. It looks like a miniaturization of some 14th century Belgian torture device. For all I know, that's what it is. Certainly looks old enough.