For glass work we use high density graphite or brass tools depending on the application. We use a variety of tools, some custom made. We have a set of Nathan Smith Tools.
Nathan Smith Glass Tools:
https://www.facebook.com/smithcustomglasstools/
To learn more about the these other tool providers check out these sites:
Mountain Glass Art Tools:
https://www.mountainglass.com/tools-and-equipment/tools
ABR Tools:
https://www.abrimagery.com/store/index.php/flameworking-tools-c-791_431?osCsid=18a55ced3227d97940c9b7019ca651d8