Will these fit a 12oz SS coffee mug?!

These are meant to fit a "Corny" keg used mostly by homebrewers these days. The lid opening on that is about 4 inches by 2 ¾ (that is a rough guess). They are also quite think at about ⅜ of an inch. The smaller gaskets are maybe ½ inch and smaller.

Will these work on a firestone keg?

Yes. I used this to replace gaskets in one of my Firestone kegs. Make sure you get a tube keg lube and give the gaskets a light coating when you install them.

Weird question, I know, can these go in the oven/withstand heat?

Thank you for your question, it can not be put into the oven.

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Description

🍺 Seal the deal with every pour—no leaks, just legendary brews!

BUILT TO LAST - Durable, easy-to-clean components crafted for long-term homebrew adventures.
EFFORTLESS MAINTENANCE - Includes a specialized o-ring removal tool to protect your gear and speed up replacements.
LEAK PROOF PERFORMANCE - Premium rubber and silicone materials ensure zero drips, preserving every drop of your craft.
VERSATILE COMPATIBILITY - Designed for ball lock keg posts, Cornelius keg lids, and dip tubes—your all-in-one kegging solution.
COMPLETE KEGGING CONFIDENCE - 28 precision-fit gaskets and seals to keep your brew fresh and leak-free.

The MRbrew Homebrew Gasket Set offers 28 durable, leak-proof gaskets and seals made from premium rubber, silicone, and hard plastic. Designed specifically for ball lock keg posts, Cornelius keg lids, and dip tubes, this kit includes an o-ring removal tool to simplify maintenance and protect your equipment. Perfect for homebrewers seeking reliable, long-lasting kegging components that ensure every pour is flawless.

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