Features: Excellent heat dissipation performance: Using high-quality aluminum alloy materials, effectively improving the heat dissipation effect for RaspberryPi4B, ensuring the continuous and stable operation of the equipment. Powerful protections function: Provides comprehensive protections to prevent potential damage such as dust, impact, and static electricity, extending the lifespan for RaspberryPi4B. Aluminum alloy material: Made of sturdy and durable aluminum alloy, it has good heat dissipation and impact resistance, protecting for RaspberryPi4B from external influences. Perfect fit: Designed specifically forfor RaspberryPi4B, with precise cutting and positioning, ensuring a tight fit for RaspberryPi4B making it easy to install and disassemble. Superior effect: The cooling hole design is reasonable, increasing air circulation and ensuring that for RaspberryPi4B maintains low temperature during high load operation. Specifications: Material:Aluminium Alloy Size:as Pictures For RaspberryPi4B Enclosure Optional Types: A/B As Pictures Installations: 01. First, install the fans on the aluminum alloy upper shell and secure them with screws. 02. Attach thermal silicone to the mainboard (or heat dissipation column is also acceptable) 03. Install the upper shell for RaspberryPi4B. Alignthe lower shell with the screw holes and tighten the screws with a wrench to secure the shell Package Includes: 1Set Aluminum Alloy Heatsink Case note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Does not include main board