Not easy to be corroded and rusted. There are welding spots around the bottom of the marble umbrella tube base, which are firmly welded and not easy to bend or break. 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 base 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 surface. This way your umbrella won't rotate or move in the wind, and can be positioned where needed. WIDE RANGE OF APPLICATIONS: Heavy-duty umbrella tube holder can be fixed on cement boards, iron boards, wooden tables, marble slabs, etc., and is compatible with umbrella poles, flagpoles, wind direction poles, and other poles. Use heavy materials such as stone slabs, cement slabs, marble slabs, or wheels to DIY an umbrella stand base that belongs to you. Color: Black Material: Stainless steel + PVC Package Contents: 1 x Umbrella Mount Stand Tube Kit Only the above package content is included; other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to vary slightly from the real thing. Measurement allows an error of +/- 1-3 cm.