After testing torque it was over at 6,2nm. If I use it for a 3D printer it will do damage on it.
Since Ender and MK8 was mentioned I was getting the impression it would fit my nozzles, that is why I got the kit. It does not, seems like the mentioned M8 nozzles are fitting my hotend but have a much larger ... head(?). So I am currently pissed at my mistake, because I could have gotten the cheaper one. And the confusing naming scheme also didn't help.