This is a mounting bracket for a small thermometer. You can buy it on AliExpress for about $1.00. I use it to monitor the temperature inside the enclosure of my FLSun QQ (https://www.thingiverse.com/thing:3165164). Holes are provided to screw it to something. Nevertheless, I used hot glue to mount it on my FLSun QQ. The hole in the bracket is 26 mm x 45 mm.

Support is not required.

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https://www.aliexpress.com/store/product/1-PCS-LCD-Digital-Thermometer-Probe- Fridge-Freezer-Thermometer-Thermograph-for-Refrigerator-50-110-Degree- Without/2142093_32879677140.html?spm=2114.12010615.8148356.6.2f8896ddPxWP3O

This object main web page is: http://www.ctheroux.com/thermometer-mounting-brackets/.

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