4-plate design to stabilize your offset patio umbrellas Easy-to-fill spout for quick filling and cleaning Endures heavy winds and keeps your patio umbrella secure Heavy-duty and weather-resistant, made with tough HDPE plastic UV-protected to prevent fading in the sun Note: Crossbar not included DIMENSIONS: Overall Dimensions (One plate): 19″(L) x 19″(W) x 3″(H) Overall Dimensions (Four plates): 39.7″(L) x 39.7″(W) x 3″(H)