Quick, the choice fell on the banana plugs of Nakamichi - this company has for decades an impressive reputation in the hi-fi industry. And I was not disappointed!
The connectors are extremely well made and have a great fit. For this purpose, I find it a great visual impact.
My cable with a diameter of 4 mm² fit easily into the connector and was anchored with the two set screws bombproof. The screws were in each case completely sunk.
For a 6 mm² cable bolts remained the way are a bit lofty, screw the plug could still quite easily.
Beautiful is not that the very quality aluminum cap is screwed by fastening the cable from the front - so you can not forget them as so often with other connectors (eg for the coax cable).