HIGH-QUALITY MATERIAL: This granite umbrella stand tube is made of high-quality industrial grade stainless steel, which is not easy to be corroded and rusted, and is durable. There are welding spots around the bottom of the marble umbrella tube base, which are firmly welded and not easy to bend and break..ADJUSTABLE NOZZLE DIAMETER: Three PVC sleeves are provided in the set. Sizes are 1-1/4"(32mm), 1-1/2"(38mm), 1-9/10"(48mm). Choose the appropriate tube sleeve according to the diameter of the umbrella pole, and then tighten the two on the stone umbrella tube holder Secure the knob so the umbrella pole doesn't wobble even on a windy day..WINDPROOF UMBRELLA STAND: There is a screw hole at the bottom of the table umbrella tube stand base. Insert the supplied screw through the bottom of the granite slate and then through the screw hole at the bottom of the Stainless Steel umbrella tube stand, and then tighten the steel screw to fix the metal tube umbrella mount on the granite slate. This way your umbrella won't rotate and move in the wind, and can be moved to where you need your umbrella, depending on your needs..WIDE RANGE OF APPLICATIONS: The heavy duty umbrella tube holder can be fixed on cement boards, granite boards, iron boards, wooden table, slate, marble slab, etc., and is compatible with umbrella poles, flagpoles, wind direction poles and other poles. Own it now, use heavy materials such as waste granite slabs, cement slabs, marble slabs, wheels, etc. to DIY a unique umbrella stand base that belongs to you, and save you money..WHAT WILL YOU GET? umbrella Stand Tube x 1, 1-1/4"(32mm) PVC pipe sleeve x 1, 1-1/2"(38mm) PVC pipe sleeve x 1, 1-9/10"(48mm) PVC pipe sleeve, steel nails x 1, metal ring x 3. Tips: If you have any questions, please feel free to contact us for help.