DIN 1683 Casting Tolerances - What does "GTB" mean?



Hello n___n
I'm using google translator so I forgive the mistakes ^^'

My name is Jessica, I'm 19 years old and live in Brazil.
Working in an Iron Foundry
I'm looking to know what would DIN 6645 GTB 17.

Do not know how to use the forum because I do not speak English if you can add me on messenger (crizolgo@hotmail.com) because it gets better understand thank you gave *-*
Thank you very much *-*

Good Night/Boa noite XDXDXD

"It's time to prove to your friends that you're worth a damn. Sometimes that means dying, sometimes it means killing a whole lot of people."

- Dwight

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