This is an adjustable bracket for 80/20 T-Slot extrusions. This can be designed to fit any size of 80/20 and I will do it if there is a specific request. Please look at this link (http://www.8020.net/T-Slot-3.asp) for an example of a few of the sizes. There are many more sizes than this page shows so knowing the proper size would make a difference in the brackets design.
Just uploaded a new version with some minor adjustments and some numbers to note 45 degree angle.

https://www.youtube.com/watch?v=P-R3NzPOgzE&feature=youtu.be

Enjoy!
~Coog