HALF MOON UMBRELLA BASE - This umbrella stand outdoor base features a flat edge for positioning against a wall or railing, ideal for half umbrellas. The stand works best with a patio table (may not secure a standalone umbrella in winds over 10-15MPH). DURABLE DESIGN - Constructed of high-density polyethylene, this outdoor umbrella base can hold up to 34lbs of sand to ensure your umbrella can withstand the wind and elements. For safety, we recommend keeping your umbrella closed when not in use. EASY SET UP - The steel stem of the patio umbrella stand will need to be inserted upon arrival and tightened with the provided Allen wrench. The powder coated shaft has dual tension screws to securely hold umbrella poles with 1.5-1.8" diameters. CONVENIENT FEATURES - Filling this outdoor umbrella stand is a breeze with the convenient fill hole and plug located on the top of the stand. The built-in carry handle on the bottom makes it easier to move and position once filled with play sand. PRODUCT DETAILS - Materials: HDPE Plastic and Steel. Dimensions: (L) 19" x (W) 12" x (H) 15". Max Fillable Weight: 34lbs. Accommodates Poles 1.5” to 1.8” in Diameter. For Added Stability, Use with a Patio Table with Umbrella Hole. Color: Black.