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. 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. Colour:Black Material:Stainless steel+PVC Package Contents: 1 * Umbrella Mount Stand Tube kit 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.