I'm not familiar with what is available over there, but here we have connectors with the same type of "crimp area".
The business end can be open, closed (ring), or a male or female "spade" (in 3 different sizes), bullet, and splice are the ones I can think of off the top of my head (and I have here)
In the use, there are usually 3 basic sizes for wire gauge, color coded to red, blue, yellow (small to large wire gauge)
The crimp I use basically punctures the center (not on the split side) and compresses it.
The cheap crimpers just smash these into an oval, very poor, the wires will slip out.
There is a specific tool with a "finger" that adds pressure to the crimp, but more importantly "locks" wires from pulling out.... see the "indent here"