Wood Survey Hubs, 2" x 2" x 6" – Box of 50 Establish solid, low-profile reference points for survey control, construction layout and staking applications with these heavy-duty Douglas Fir survey hubs. The substantial 2" x 2" profile provides a durable ground marker with a broad top surface for nails, tacks and other point identification. Key Features 2" x 2" x 6" wood survey hubs for control and construction layout applications. Heavy-duty square profile provides a solid, stable ground reference. Broad top surface accommodates survey nails, tacks and other point identification. Made from quality Douglas Fir sourced from the Pacific Northwest and manufactured in Central California for strength and dependable driving.