Under Desk Headphone Hook

The screw hole is for a #6 Wood Screw.

You'll probably want to sand down all of the edges to keep the pads of your headphones from catching on any burs or blobs.

OnShape document: https://cad.onshape.com/documents/a2a3f02a3be84ce381d144eb/w/bc9ea9c693924f2c92c4aa49/e/3d2d4e24bff3444b8b004ff8