Specifications:Color: BlackMaterial: HDPEEach Plate Size: 20" x 20" x 3" (L x W x H)Net Weight: 18.5 lbsIs Assembly Required: NoPackage Includes: 4 x Plates, 4 x PinsDescription:Keep your outdoor umbrella securely positioned with this 4-piece fillable patio umbrella base designed for offset and cantilever umbrellas. The interlocking square plates connect with metal locking pins to create a dependable foundation for your umbrella cross base, making it suitable for patios, decks, poolside seating, gardens, and other outdoor living spaces. Each plate features a wide filling opening with a twist cap, allowing quick filling with water, sand, or a sand and water mixture. When fully filled, the combined weight reaches up to 164 lbs to help support compatible umbrellas. The plates also empty quickly for seasonal storage. Designed for convenience, each plate includes an integrated grooved handle for easier lifting and repositioning. After use, the plates stack neatly together to reduce storage space. Tool-free installation lets you align the plates beneath the umbrella cross base, insert the locking pins, and complete setup in minutes.