Why don't drives come with the screw

What screw should i use for ssd? m2 slot screw HP uses a very elusive mounting screw mechanism in their computers Not only is it a m2 slot screw m2 ssd Screws Kit PCIe NVMe SSD Mounting Screws NVME SSD Mounting Screws

m2_1 slot Screw SSD Mounting Kit with ASUS Motherboard