Coil Spring Traps are foot-hold restraining devices used to catch and hold wild animals. These devices have been used for over a century as a cost effective and efficient tool for managing wildlife populations. Coil Spring Traps are manufactured from steel components and powered by a set of compact coil springs. If you are just looking to get rid of a few nuisance varmints or are trying for serious predator control, these traps are up to the job. The 4x4 means there are 4 coil springs instead of the traditional 2, which provides a faster closing jaw and more holding pressure.