Screw pole anchor is made of steel pipe,steel box, and formed by welding. Steel pipe forms the body of spiral post anchor, which could better ensure Max.strength at conical ends. Thus to screw into different soil. It could be well adapted to various supporting system and installation. Size and type of box on screw pole anchor are optional. This is designed to strengthen the side power of pole anchor and extend its life. Spiral shaft is continuously welded on the steel screw pole anchor, to compress soil, to make it reach Max.