Plastic fence posts and enclosures

A fenced enclosure having fence posts arrayed in a line and wires supported by said posts, the improvement comprising having a majority of said posts in the form of a releasable and reusable injection molded thermoplastic resin member having a top section extending more than half the length of the member, and a bottom section, the sections of said member being constructed with a front flange, a rear flange parallel to the front flange, a web intersecting the flanges, and a plurality of wire engaging members projecting forwardly from the front flange, the intersecting web extending laterally from the front flange to a short distance beyond the rear flange, the vertical extent and thickness of said web being greater than said flanges and the width of said front flange being greater than said rear flange, the bottom of said web being a point, at least one of said flanges includes an outwardly extending support plate in the bottom section of the member, said support plate having a rectangular section and an adjacent trapezoidal section converging towards the nearer end of said flange, the cross-sectional area of said integral support plate being sufficient to support said member in an upright position.