Rivet solder terminals (also called "eyelets") are small metal sleeves with an opening at both ends that are often used in the electronics industry as fasteners for electronic components. Rivet solder terminals are typically used in through-hole technology (THT), where they are inserted through a hole in the PCB and then soldered to the opposite side of the PCB. They are used to create a mechanical connection between the PCB and other components, especially in applications where a strong and permanent connection is required.