Anchor Hocking Fire King Philbe Sapphire Blue Replacement Casserole Lid Only, 8 inches in diameter overall, fits casserole with an opening of 7.5 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 mark/dimple, no chips, no cracks.