The 10mm M3 metal female-male spacer is a type of hardware component used to provide a specific distance between two components in a mechanical assembly. The spacer is made of metal and has a diameter of M3, which is a standard screw thread size. The spacer is 10mm in length and has a female screw thread on one end and a male screw thread on the other end. This design allows it to be connected to both female and male threaded components, providing a secure and stable connection. The 10mm M3 metal female-male spacer is useful for applications in electronics, mechanics, and other fields where a specific distance between components is necessary.