The file 'Bobbin Cover Bed Slide For Juki Lu-563 Lu-562 3D Printer Model' is (stl) file type, size is 17.8KB.
This is a slide cover for Juki sewing machines. This may also work for other singer 111 clones.
The original holes are close to a 10-24 thread but they could be metric. I just ran a 10-24 tap through them.