PROFESSIONAL DESIGN: The outdoor umbrella base can be inserted into the ground, absolutely sturdy and won't be easily blown away by the wind like the old-fashioned ground umbrella stand. SPACE SAVING: Compared to older patio umbrella stands, the Wanhork Inground Patio Umbrella Base is more convenient and doesn't leave obstacles on the ground, so you don't have to worry about bumping into things while carrying or walking around. MATERIAL & SIZE:Made of durable, High-Strength Steel (mounting panels made of stainless steel, waterproof and rustproof), Dimensions:L 11.3 inches x W 11.3 inches x H 18.9 inches, Weight:20.4 lbs. WIDE APPLICATIONS: The in-ground umbrella base bracket is not only suitable for all sizes of cantilever umbrellas, but also for most upright outdoor umbrella bases (for umbrellas that need to be mounted without a base, please search for this brand of flange bases, suitable for a range of diameters: 1-2 inches); also suitable for a wide range of mounting environments, and other outdoor areas. Decks, gardens and other outdoor areas. INSTALLATION: Inground patio umbrella stand is segmented design, firstly dig a pit 20 inches in diameter and 18.9 inches in depth where the umbrella will be installed, place this product into the pit, and then pour in the cement sand and concrete (approx. 700 lbs.), lastly, wait for it to set and then the outdoor umbrella can be installed.