The 4-Piece Heavy Duty Cantilever Offset Patio Umbrella Stand Square Base Plate Set is a must-have accessory for any patio umbrella. This sturdy base plate set is designed to keep your patio umbrella upright and secure, even in heavy winds. The base plates are made of heavy-duty HDPE plastic, which is both impact-resistant and weather-resistant. The leaves are also treated with a UV-resistant coating to protect them from the sun's rays. The base plate set is easy to assemble and has an umbrella pole holder. The holder is connected to the bottom of the base with a three-pin buckle, which keeps the umbrella firmly in place. The base plates also feature easy-to-fill spouts and twist caps, making it quick and easy to refill them with water or sand. The leaves can hold up to 15 liters of water or 50 pounds of sand, so your patio umbrella will remain upright in heavy winds. This base plate set is perfect for patios, decks, and other outdoor spaces. Patio Umbrella Stand Square Base Plate Set, Heavy Duty Cantilever, four pcs: Sturdy design with interconnecting pins to lock in place Easy-to-fill spouts for quick and easy refills High weight capacity, can hold up to 15 liters of water or 50 pounds of sand Heavy-duty and weather-resistant HDPE plastic Easy to assemble with an umbrella pole holder UV-resistant coating to protect from sun's rays Perfect for use on patios, decks, and other outdoor spaces Designed to work with cantilever offset patio umbrellas Great for events such as weddings, parties, picnics Crossbar base not included. Specifications: Color: Black Material: HDPE Item Weight:7.65kg/16.86 lbs Product Dimensions: 20.08" x 19.88" x 2.83" Package Includes: 1 x Base 1 x Instruction