STURDY 4-PLATE DESIGN - Made with interconnecting pins to lock your umbrella base in place and secure it for hours of enjoyment (Note - Crossbar base not included)EASY-TO-FILL SPOUTS - Each plate is built with a fill spout and a twist cap to create a water-tight seal for quick and easy refills, ballast disposal, and relocationHIGH WEIGHT CAPACITY - The plates can hold up to 13.2 liters of water (per plate) or 38.9 pounds of sand (per plate), so your patio umbrella will have a reliable anchor pointHEAVY-DUTY & WEATHER-RESISTANT - Made of HDPE plastic to withstand impact and constant movement, and treated with a weather- and UV-resistant coatingOFFSET UMBRELLA ESSENTIAL - Provides a solid anchor for compatible umbrellas and protects them from incidental damage caused by falls and harsh weather (Search - SKY5681 or SKY5248)DIMENSIONS - Overall Dimensions (One plate) - 19.9"(L) x 19.9"(W) x 3"(H)Overall Dimensions (Four plates) - 39.8"(L) x 39.8"(W) x 3"(H)Weight - 19 lbs.SPECIFICATIONS - Material - PlasticCapacity (per plate) - 13.2L of water, or 38.9lbs. of sandIncludes - (4) Base platesNo assembly requiredFor Residential Use Only