This is a set of 8 low-profile flat-head screws for securing 2.5-inch HDDs and SSDs to NAS HDD trays. These are unused, as they were included in a maintenance kit I purchased for a new Synology NAS but were not needed. I have multiple sets in stock. If you would like more than 9 screws, please let me know in the comments section. I can offer a slight discount on shipping. These screws are for fixing HDDs to NAS HDD trays from brands like QNAP, Synology, I-O DATA, ASUSTOR, and METIS PLUS. Regular flat-head screws may have heads that protrude, preventing the tray from fitting into the NAS. However, these screws fit neatly into the screw holes, allowing for smooth tray insertion and removal without interference. Perfect if you need screws when switching from an HDD to an SSD!