For Raspberry Pi 4 Model B Black Aluminum Case Box Enclosure with Heatsink Bracket (Black) Features: Selection of premium CNC aluminum alloy, through anodized surface treatment, beautiful and durable. Designed with dense cooling holes on the surface for quick heat dissipation. All ports and slots of aluminum box are perfectly fit for Raspberry Pi 4 model B. Open design, don't worry about affecting WIFI signal. Simple structure, complete with screws for easy installation.  Specification: Condition: Item Type: Aluminum Case Material: Aluminum Alloy Optional Color: Black, Green, Silver Size: Standard Size Fitment: Fit for Raspberry Pi 4 Model B / B+   Package List: 2 x Aluminum Housing 8 x Screw 2 x Bracket   Note: 1. Due to the difference between monitors and light effects, the pictures may not reflect the actual color of the item. 2. Please allow slight error due to manual measurement. Thanks for your understanding.