This square umbrella base is designed for durability and ease of use in all weather conditions. Made entirely from HDPE material, it is built to withstand strong impacts and resist the elements, ensuring a long lifespan. The 4, 20 in. x 20 in. plates can be locked together using locking pins (not included) to form a solid base for cantilever umbrellas, and they can be stacked for easy storage when not in use. Filling the base is simple with the built-in spout, which allows for easy filling with water or sand, and a sealed screw cap prevents leaks during use. Each plate holds up to 3.4 gal. of water or 5.2 gal. of sand, providing ample weight for stability even in windy conditions. The lightweight design (4.5 lbs. per plate when empty) and convenient handle make it easy to transport and move to your preferred outdoor location. Color: Black. Material: Plastic.