> ## Documentation Index
> Fetch the complete documentation index at: https://calcs.com/docs/llms.txt
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# ESICS: Bracket-on-a-Bracket
> The bracket-on-a-bracket feature of the bracket checker allows the user to design an arrangement with a symmetric bracket being held by an inner ...
The bracket-on-a-bracket feature of the bracket checker allows the user to design an arrangement with a symmetric bracket being held by an inner bracket as seen in Figure 11.
**Figure 11. Example Bracket-on-a-Bracket System**
To activate this feature the user has to select a symmetrical bracket in the bracket selector. Once a symmetrical bracket is selected this toggle shown in Figure 12 is prompted to the user asking them whether they would like to design a bracket-on-a-bracket system. As the bracket-on-a-bracket arrangement is selected, another set of bracket properties inputs is visible to the user that will define the properties of the inner bracket.
**Figure 12. Bracket-on-a-Bracket Toggle**