Simple L bracket with supports on the sides.
The original dimensions are:

Length: 7cm
Height: 2cm
Width: 2cm
Thickness: 0.5cm

I designed this bracket to attach my 450w EVGA PSU to my Anet A8 3D printer. The bracket completements the ATX PSU enclosure I shared before https://www.thingiverse.com/thing:2666294