XIANQI Patio Umbrella Stand Accessories with Screws, Outdoor Umbrella Pole Mount Umbrella Mount Holder Turn Knob Fit 2.17inch Poles for Patio Table Balcony Decks Backyard Premium Material: The umbrella hole base made of high-density polyethylene plastic, sturdy and durable, extrusion resistance and temperature resistance. The screws are made of stainless steel, not easy to corrode, good fastening performance. Easy to Install: Choose the umbrella ring according to the diameters of umbrella poles, insert the umbrella pole into the base, and then tighten the M8 thread, and don't forget to adjust the knob to prevent the umbrella from slipping off for your better using experience. Wide Application: Classic black color, will match with all your outdoor furnishings and allow for more space. Can be used on the beach, backyard, balcony and poolside. Colour: Black Size: Diameter 3.8cm, 4.8cm Delivery Quantity: 1 Piece Set