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The Lid Master Calipers are made from plastic.
Calipers from Lid Master take the guesswork out of sizing lids for pots and bowls.
Measure an opening on the pot, tighten it in that position, and you will have the correct size for the lid on the other end.
Standard Lid Master sizes lids up to 11-1/2" in diameter
Large Lid Master sizes lids up to 16-1/2" in diameter.