Latest Raspberry Pi 4 Aluminum Alloy Case with Cooling Column Passive Cooling Case for Raspberry Pi 4 Model B There are four screws for you to fix the case with Raspberry Pi board. Increasing the large Cooling column allows for better heat dissipation. Increase the power cooling column to bring better heat dissipation to your Raspberry Pi 4. No longer worry about overheating. Durable, hard, long-lasting rust-free, wear-resistant, and can be well protected to your Raspberry Pi 4.