Sheet metal parts have style parameters that describe their characteristics and how they are manufactured. These parameters are captured within a named Sheet Metal Rule (for example: 10 gage stainless steel or 16 gage anodized aluminum) which is applied by default when you create a new sheet metal part.
Use Sheet Metal Defaults on the Setup panel of the Sheet Metal tab to change the options and parameters for the active sheet metal part from those options defined by the selected Sheet Metal Rule.
Sheet Metal Defaults dialog box allows you to: