Coupler 5mm to 8mm

Hi there people!

In my work to build a cnc plotter machine, i needed to create a coupler for my steppers and thread rod.

One side is 5mm and the other is 8mm. I made two holes passing throug the coupler with a 3.5mm spacing, you surely can fit a M3 screw with a M3 nut on the other side.

Hope you like it, works for me!