This is the most popular type of fence to keep animals out. These kits consist of poly fencing (in all different heights and strengths) or steel on top, paired with some smaller opening size steel fencing (in different heights, strengths and opening sizes) on the bottom. The purpose of these snake fence kits is to not only exclude large animals like deer, coyotes etc (poly fence is great for large animals) but also small animals like snakes and other wildlife (rabbits, groundhogs).