With a fixed base, it is stable and it will not shake. This umbrella stand has a simple installation process, only need to tighten the screws, no other installation tools are needed.Most importantly, this umbrella stand is retractable, which is convenient for you to adjust the height of the umbrella stand. The detachable and foldable design is convenient for you to carry and use.Made of high quality plastic and metal material, it is lightweight and durable to use.There are 4 styles to choose from.It is suitable for wheelchair, stroller, walker, deck chair or scooter.Item Name: Umbrella ConnectorMaterial: Plastic,MetalFeatures: Telescopic, Foldable, AdjustableSize Details: Style A Length after Extension: 46cm/18.11" (Approx.)Style B Length after Extension: 52cm/20.47" (Approx.)Style C Length after Extension: 46cm/18.11" (Approx.)Style D Length after Extension: 48cm/18.9" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Umbrella Connector