This is Geekworm design metal case '''only ONLY for the Orange Pi 4B, not for Orange Pi 4'''. You can refer to [[N400]] if you want a metal case for Orange Pi 4;
It reserves all the interfaces of the orange pi 4 motherboard, supports the cooling fan, supports the extraction of the GPIO cable, and also reserves 2 antenna holes for you to replace the antenna that comes with the motherboard.