Screw Size Request

The three added holes on the spindle mount for add ons, what is the size of the screw please?

Try here: https://workbench.grabcad.com/workbench/projects/gcl5zpCuwqCXWLvYktLQBc-2IHvossNo37ycTOkzg6gREW#/space/gcvs_XeRNVzNkfG_tFTAMd0C2lBbCsLcagOxXb1Jlki0kT/link/132067

TY, forgot I had access to that!