Summary

This is a customizable wire loom clip. You can specify the number of wires and their diameter.

It also has some eyes which are intended for wire ties to hold the wires in and/or secure the clip to something.

It could be used for other things of course, but it was designed with spark plug wires in mind. (That's what the attached stl files are.)

Also, I feel compelled to mention that I have not driven with these for any length of time. Whether they can maintain their grip near a hot engine is presently unknown.

In practice, I think things like organizing CAT 5e Ethernet cables might be a better use for this.

More information and alternatives are listed on the main project page, here:
https://theheadlesssourceman.wordpress.com/2014/06/01/customizeable-wire-loom/

UPDATE: I was correct in my statements above. Though the part lasted longer than expected, it eventually failed. See the last photo above. I think that wrapping a zip tie around the whole thing so that it can't deform would help though.