Heavy metal: This granite umbrella holder is made of solid steel, strong and durable, high hardness, not easy to bend or break. The black powder-coated surface is both visually appealing and acts as a protective layer, enhancing resistance to outdoor elements. Adjustable knob: Umbrella holder suitable for 1.5-2 inch umbrella, the knob on the patio umbrella stand is fixed according to the diameter of the umbrella rod, providing a safe and stable installation solution, so that even on windy days no longer shake! Sturdy and reliable: The replacement of the pole of the umbrella holder stand can firmly fix the umbrella on the plane, ensuring that the umbrella will not tilt and fall when the wind is blowing, so that you can enjoy the outdoor leisure time freely. Multifunctional installation: Our umbrella pole mount stand parts set have a screw hole at the bottom and can be attached to a variety of surfaces such as granite, iron, wood, stone and marble. It can be used on the beach, swimming pools, courtyard, etc., providing a variety of placement options. Easy to install: There is a 10mm screw hole at the bottom of the umbrella stand. Now make a 10mm hole on the rock and align the gasket with the screw hole. Put the attached bolt through the screw hole at the bottom of the umbrella tube bracket and the granite slab, and then tighten the screw.