Not easy to be corroded and rusted, and is . 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 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 . This way your umbrella '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: duty umbrella tube holder can be fixed on cement boards, boards, iron boards, wooden table, , marble slab, etc., and is