> For the complete documentation index, see [llms.txt](https://windows.help.formit.autodesk.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://windows.help.formit.autodesk.com/tool-library/shell.md).

# Shell

From a solid object, you can create a "shell" of a specified width. Shells are useful for quickly creating walls from a massing model: