Add a the finishing touches for your Batarang!
The caps fit on both sides for that professional "Bat Look"
Goes over screws on both sides. Add a little hot glue to keep it in place.
My company made a few of these for the various Batman movies (Forever and B&R). Nice to play with this with my Son!

Thanks to plainolddave for making the Batarang File!

Best to print this at 100mm for the detail.
200mm looks OK though you loose detail in the logo.
Have fun!