Summary

This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/f4jgwVK4puh

Mark 1: http://www.thingiverse.com/thing:1718295

Both are designed to mount string LEDs to 1 3/8" pipe used for the frame of the carport. BTW, that's the same diameter as a chain link fence top rail here in the U.S..