Product size about :As shown in the figure Product materialsteel  It is made of high hardness steel and sturdy.  Adjustable double nut design, double fixation, more peace of mind when using.  Double-sided fixing design is more stable than the single-sided fixing device on the market.   -AFTER-SALES SUPPORT: If you have any questions or concerns about our products, please feel free to contact us. We will be happy to serve you and ensure your satisfaction. Precautions: 1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size, you can contact us at any time. We will give you some suggestions, but for your reference only. Package Included: 1 pcs/1set Adjustable canopy pole holder