reliable and reusable, sturdy and safe, with high temperature and weather resistance characteristics, threaded knob is made of quality black plastic and stainless steel, not easy to break or rust, which can you for a long time Effectively reduce the wind caused by the umbrella shaking; Also can protect your umbrella to avoid friction on the umbrella pole scratches and dents Easy to Use: you can choose 2 sizes of umbrella hole covers according to your different diameter umbrella pole, put them together tightly to keep the umbrella stable; Then tighten the M8 40 mm thread after installation, and adjust the knob to avoid the umbrella from slipping Widely Applicable: these umbrella replacement parts are practical and classic tools, which can be installed in most umbrellas for more in outdoor spaces, such as beaches, backyards, balconies, poolside and more, bringing much convenience Material: Metal+Plastic colour: black Package Contents: 1 x Umbrella Base stand Replacement kit(12pcs) 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.