Corks for Belgian-style ales. 23.5 mm fits American champagne bottle with 16.5 mm opening. (This bottle will accept a standard 26 mm American crown.) 25.5 mm fits bottle with 18.5 mm opening. For example, Duvel, Chimay, Unibroue bottles. To be sure, simply send us a bottle or measure the bottle opening with calipers.
~16-19 mm of cork should be left outside the bottle.
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