The No-Dig Ground Anchor offers a faster, cleaner, and easier way to install your mail post. It's an ideal way to avoid digging a hole and mixing concrete, it truly is a time saver. Accommodates a standard 4x4 wood post (not included). Includes 5x lag bolts and a 20" length of rebar to twist the screw into the ground. Made of galvanized steel. Best suited for standard soil conditions. Not recommended for rocky or extremely sandy conditions. Suitable for installations with any Mayne mail post. For further questions please contact MAYNE INC at 1-866-363-8834.