Dimensions of Dome Lid Base Outer Diameter (including glass flange): 3.56 inches (approx. 90.4 mm). This flare rests cleanly on top of the jar's outer rim. Fitment (Plug) Outer Diameter: 2.88 inches (approx. 73 mm). This is the width of the lower glass section that slips into the neck. Overall Total Height: 2.13 inches (approx. 54 mm) from the bottom edge to the peak of the rounded dome. [1] Dimensions of Flat Lid Total Outer Diameter: 3.44 inches (approx. 87.4 mm). The flat, thin upper glass shoulder extends to this width to sit horizontally flush on top of the jar's outer rim. Fitment (Plug) Outer Diameter: 2.88 inches (approx. 73 mm). This is the recessed glass step-down ring underneath the lid that plugs into the mouth of the jar. Inner Gasket Compatibility: When wrapped with the standard soft plastic inner fitment ring, it securely seals the universal 2.91-inch (74 mm) inner neck opening shared by the 8 oz, 16 oz, and 24 oz jar sizes.