Anchor Hocking Fire King Philbe Sapphire Blue Replacement Casserole Lid Only, 7.25 inches in diameter overall, fits casserole with an opening of 6.25 inches (measuring from edge of unside ridge to edge of underside ridge).  The photo taken against a white background is to give you a better idea of the light blue color of the glass.  Vintage item in good condition, as-made straw marks, no chips, no cracks.