Small stands to accommodate a 5015 radial fan. The correct height for the RatRig V-Core 3 and BTT octopus 1.1.
Use double sided tape on the bottom of the stand to stick them on. The holes are meant to be a tight fit on M4 bolts. You might have to drill them out a bit using drill 3.5mm. Thread in a bolt to make threads before installing in the electronics panel.
easiest way to install is by installing the fan on the stands prior to installation in the E-bay.
The author hasn't provided the model origin yet.