5x5 , 8x5, Sandwitch style Z Coupling, internal nut lock, conical hole

I really love the concept behind Eric's Z Axis Coupler, but i really love the looking of the sandwitch style couplings. So i decided to make the fusion between them. I hope you like the concept. If you need other dimentions let me know. But i will add them later anyway. The internal hole has a conic shape so the grip is solid.

5x5= 31x20x21
8x5=31x20x21

If something is labeled as test it means it should work, but i did not print that yet.