The 10 mm M3 Metal Female-Female Spacer, also known as a Standoff-Spacer-Riser, is a hardware component used to provide a space between two PCBs (Printed Circuit Boards) or between a PCB and a mounting surface. It is made of metal and has a threaded hole on both ends with a diameter of M3, which is compatible with M3 screws. This spacer is typically used in electronic devices, such as computer motherboards, to provide separation between different components and to prevent electrical short circuits. It also helps to dissipate heat and to improve the overall reliability of the device. The 10 mm length of the spacer provides a convenient solution for spacing and fixing different components in a compact design.