This model is designed to mount two standard cooling fans (25mm x 25mm x 6mm) (such as https://www.amazon.de/L%C3%BCfter-25x25x6mm-18dBA-Sunon-MF25060V21000UA99/dp/B07FZZ8YRL) onto Google's Coral USB Accelerator (https://coral.ai/products/accelerator/).
Especially when the device runs at maximum speed, a proper cooling solution like this is strongly recommended.
Assembly simply requires 4-8 M3x12mm screws (depending on whether you're using 2 or 4 screws per fan) as well as 4 M3 screws of variable length (minimum 23mm) depending on the surface to which you're mounting the USB Accelerator. Because every screw hole already has printed threads, there is no need for any nuts.
65mm x 30mm x 14mm (same length and width as the USB Accelerator, should fit perfectly).