What size would I need for 20mm bottom and 30mm top? A sizing chart would sure be nice.

I use a chart I found on online, but it is in inches. Perhaps you can convert them to mm?Stopper Size Bottom Diameter (Inches) Top Diameter (Inches) Avg. Diameter (Inches)#2 5/8 3/4 11/16#3 11/16 7/8 13/16#5.5 15/16 1-1/16 1#6 7/8 1-1/4 1-1/8#6.5 1 1-1/2 1-1/4#7 1-3/16 1-7/16 1-5/16#7.5 1-1/4 1-1/2 1-3/8#8 1-5/16 1-9/16 1-7/16#8.5 1-7/16 1-11/16 1-9/16#9.5 1-1/2 1-3/4 1-5/8#10 1-11/16 1-15/16 1-13/16#10.5 1-13/16 2-1/16 1-15/16#11 1-15/16 2-3/16 2-1/16#11.5 2 2-1/2 2-1/4 #00 Stopper fits and plugs the airlock hole in a drilled stopper so it can be used as a solid stopper#2 Stopper fits standard wine bottle opening#6 Stopper fits wine making and beer brewing industry ½ and 1 gallon jugs#6.5 Stopper fits standard 6 gallon glass carboys#7 Stopper fits standard 3, 5, and 6.5 gallon glass carboys#10 Stopper fits standard 3, 5, and 6 gallon plastic carboys#11 Stopper fits Demi Johns (14.25 Gallon Glass Carboys)#11.5 Stopper fits most oak barrels

is shipment per item or per order ??

amazon has this item set for per item

For formenting veggies, do you drill out the jar top to use these? And if so what size bit or method do you use?

I love these stoppers for bottles like gallon milk or wine jugs, or large juice bottles. Seems to me you could drill using any drill or cutter whose diameter doesn't exceed the big end of the stopper. However I fear the thin hole edge might damage the stopper with use. Instead, for veggies I would use mason jar fermentation lids available here on Amazon. These stoppers can be used with them if need be, but those lids often come as complete kits.

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🍺 Seal your craft like a pro—freshness locked in tight!

DURABLE RUBBER BUILD - Resilient material withstands repeated use without cracking or warping.
SECURE AIRTIGHT SEAL - Keeps your brew fresh and contamination-free with a snug fit.
COMPACT LIGHTWEIGHT - At just 49.9g and 2.54cm³, it fits seamlessly into your brewing setup.
PRECISION DRILLED DESIGN - Engineered hole ensures perfect airlock placement every time.
SET OF 3 FOR CONVENIENCE - Multiple stoppers mean you’re always ready for your next craft batch.

The Craft Brew Drilled Rubber Stopper 6 (Set of 3) is a compact, durable rubber bung designed to provide an airtight seal for homebrewing bottles. Its precision-drilled hole securely holds airlocks in place, ensuring optimal fermentation conditions. Lightweight and reusable, this set of three stoppers is an essential tool for any serious craft brewer.

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