This is a mounting bracket for a Meanwell LRS-150-12 12VDC Power Supply. This power supply has oddly placed mounting screw holes that make it hard to fasten, so I made this bracket that picks up the mounting screws plus features on the edge of the supply to create a bracket to hold the supply in 4 places. The bracket also raises the power supply up about 1/4" so that air can flow under it and keep it cool.
This bracket was used to install the power supply internally on a Monoprice Select Mini 3D Printer. You can see how it was done on our Hack-a-day page here: https://hackaday.io/post/48839/
You will need some M3 screws and nuts to attach this to your power supply and mount it. The screw length will vary depending on your mounting position and the thickness of the material. You can measure after you print it and get the best length screws for your application.