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These are .77 inches high.

They are about 3/4 " high. But remember your second question, because you said your scope had a 30mm main tube but these rings are for 1" main tubes. It was my pleasure to assist you.

Max, These medium rings are perfect for 40mm objective lens scope with 1" tube.

Max, then, these are what you want for your 1 inch 40mm scope Sir. Cheers!