It is an application that will be useful for measurements with a multimeter. Measurement is made by drilling 0.8mm or 0.9mm holes in the measuring instrument probes and attaching them directly to the header pins on the circuit boards. Or an unassembled capacitor, resistor, etc. It is used for measuring electronic components.
Although there are various additional apparatus and probe sets, evaluating what you have is a good example for development. This application was made on old worn probes, I think, in order not to damage the new probe during the drilling process.