[All-around force more stable]Equipped with four rotary knobs, so that the outdoor umbrella in the case of fixed will not appear space loosening, umbrella frame rod sliding and umbrella frame tilt, and other problems. Adjustable range: 1.12inch-1.57inch [Suitable for three scenarios]The bottom design is suitable for mounting on concrete, wooden decks, and lawns, and comes with all the required mounting accessories. [Installation Use] Patio/pier umbrella base brackets can also be used for flag pole brackets, light pole brackets, selfie camera brackets, shade sail pole brackets, and other types of poles suitable for residential and commercial use [Widely use]This umbrella base stand works great for decks, , pontoons, patios, picnic tables, and any place else you can fasten it with the included lag screws. [Antirust materials]This deck mount umbrella holder is made of a heavy-duty metal base for durability. No rusting. Colour:black Material:Metal Package Contents: 2 x Patio Umbrella Stand Multifunctional(with mounting screws) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.