[All-around stability] Equipped with four rotary knobs to ensure the outdoor umbrella remains securely fixed, preventing issues such as frame rod sliding, loosening, or tilt. Adjustable range: 1.12 inch - 1.57 inch [Suitable for three scenarios] The bottom design allows mounting on concrete, wooden decks, and lawns. Includes all necessary mounting accessories. [Installation and use] Patio and pier umbrella base brackets can also be used for flag poles, light poles, selfie camera mounts, shade sail poles, and other poles for residential or commercial applications. [Widely applicable] This umbrella base stand is ideal for decks, pontoons, patios, picnic tables, and other locations where it can be secured using the included lag screws. [Anti-rust materials] Constructed with a heavy-duty metal base for long-lasting durability. Resistant to rust. Color: Black Material: Metal Package Contents: 2 x Patio Umbrella Stand Multifunctional (with mounting screws) Note: Light reflection and differences in display screens may cause slight variations in color compared to the actual item. Measurement error allowance: +/- 1-3 cm.