Our 6 ft recycled plastic HPDE post doesn’t require any special prep work to be installed below grade. Our posts don’t contain any fillers or structural additives so they remain fully recyclable. While not rated for structural use, they are perfect for mounting signs, literature boxes, birdhouses, landscape timbers, and garden boxes – the uses are endless. And because they won’t rot or split, they are the best choice for applications on the ground or below grade. Shown with an attached sign (sign not included).