6mm Round Link connector, Cylinder Rod End

This is a link / connector designed to fit onto 6mm threaded rod for connecting at various angles.

the bore for the throat is tight enough for the threaded rod / bolt to create its own thread and maybe strengthened with using some glue.

P.S.
As anode505 is correct to point, don't forget to use lock nuts on the end to prevent the rod going too far through and also it helps adjust the length. I have uploaded another picture of this.
Cheers