These heavy duty 4 ft step-in fence posts will help keep your property protected when used with an electric fence system. The Fi-Shock Purple 4 ft Step-In Fence Post has molded clips that hold electric fence wire & poly tape (up to 2 in wide). Each 4 ft post is molded of reinforced polypropylene with a heavy-duty steel stake. Containing extra reinforcing ribs for strength， each post also features a large step-in flange and anti-rotation spike to keep the stake from turning.