Uxcell 9pin Ceramic Vacuum Tube Socket 53mm Aluminum Shield for 12AX7 12AU7 ECC83 ECC82 Tube Silver Tone

What is this? Aluminum shield cap with built-in spring can quickly dissipate heat and effectively protect the electronic tube from damage Is there any advantages of the product? Made of Aluminum Durable and not easy to rust. How to use it? Align the snap and directly push the tube socket base to complete the installation What should I notice? Please confirm the model and the size before you buy.