This patio umbrella base is constructed from heavy-duty 201 stainless steel with an outdoor high-temperature frosted powder coating, offering excellent water and rust resistance for installation on wooden or concrete deck floors. Its multifunctional design not only secures outdoor umbrellas but also enables DIY installation of flagpoles, light poles, or torches, making it ideal for decks, patios, picnic areas, and more. With a 1.5 in. inner diameter compatible with 1.5 in.-2 in. umbrella poles, the base measures 4 in. W x 13.8 in. H and weighs just 1.76LB. The set includes hex screws for wooden floors and expansion bolt sockets for concrete surfaces. Installation is simple: drill pre-set holes, insert screws with a ratchet, slide in the umbrella pole, and lock it in place with the included hand screw. All components—1 base, 4 hex screws, 4 expansion bolt sockets, and 2 hand screws—are made of high-quality steel, ensuring the frame remains shiny and new even after prolonged use, providing a sturdy and durable mounting solution for outdoor shading setups. Color: Black. Material: Metal.