Description Keep your flags and banners secure in the ground with this premium ground screw! This heavy duty item is designed to use in sand or any in-ground surface for larger banners, providing your promotional display extra stability. Protect yourself against concerns such as high winds or loose ground. It has the same rotor as the cross bases and features folding handle supports for easy installation. The Premium Ground Screw can be used with pole sets that have a 16mm (0.63") interior diameter.