Outdoor Essentials® 4 in. x 4 in. x 7 ft. Evanston Spaced Picket Vinyl Routed Line Posts were specifically designed for use with Pro Series Evanston 5 ft. Spaced Picket Fence Panels. These posts have routed holes to accept 3 fence rails. The rails from the fence slide into the routed holes in these posts and lock into place for an easy, fastener-free connection. Routed holes are on opposing sides of the post to connect fence sections in a straight run.