All-Weather Material: Crafted from HDPE, a lightweight, weather-resistant material commonly used for outdoor essentials, this patio base stand is water and scratch-resistant, designed to endure the elements and provide long-lasting durability. Fillable Base Stand: This patio umbrella base is designed to be filled with 51 lb of water or 76.2 lb of sand for added stability. The base can be easily filled or emptied through a convenient hole. When not in use, emptying the stand makes it effortless to transport. Adaptable Thumb Screw: The adjustable knob on the steel tube secures the umbrella in place and fits poles of various diameters. Easy to operate, it offers reliable support and added stability for your parasol.