It is a creation from a maker, after receiving some original units.I believe it even includes construction files of his version.
I need it for stranded and larger wires which won't fit into the common solderless breadboards.
For stranded wire, strip 5mm insulation off the ends, twist the strands neatly and tin with solder. Usually easy to insert into ordinary breadboard after that.As for larger wires, why are you using them? If because of larger currents, then you shouldn't pass more than. 1A through a breadboard anyway. For temporary prototyping with high currents, keep those wires away from breadboard and use terminal strips instead.