Replacement filter cube for Leica microscope. Holds the same standard 25mm optics and dichroic mirrors. Holes are intended for an M4 tap. For the bottom part, use magnetic screws for the hole on the back and two holes on the under side as this clamps the cube in place. Adjust how far in these are screwed to adjust the angle of the mirror. This needs to be a snug fit in the microscope so depending on excess material it may need sanding to slide smoothly into place. You may also need to shrink the bottom part vertically by 1-2% if you need more movement adjusting the angle.