This is a simple voltmeter housing. These voltmeters are widely available on AliExpress or eBay. Their display size is typically 2.4cm x 1.4 cm (0.36 inch). The mounting holes are 28mm apart. You will need either 2 small screws or some glue to assemble it. Support is not required.

This object main web page is: [http://www.ctheroux.com/voltmeter-housing/](http://www.ctheroux.com/voltmeter-housing/).

You can request the source files on the page listed above.