1,made from steel 2,hot dipped galvanized,paited,electric galvanized on the surface 3,cost and time saving 4,no digging Ground Screw Pole Anchor:1,Material:Carbon Steel2,Length:450-900mm3,Size:61x61-121x121mm4,thickness:1.5-3mm5,Surface:Hot dipped galvanized,electric galvanized,painted,or as per buyer's option.contract :Mable Mamobil:13191863895 ground screw