Setting Thickness
Use the General page of the Sheetmetal Preferences dialog box to set the thickness.
1. Click > > 
Model Properties. The Model Properties dialog box opens.
Model Properties. The Model Properties dialog box opens.2. Under Sheetmetal, click change in the Thickness line. The Sheetmetal Preferences dialog box opens.
3. Click the Thickness box and type a new number for the sheet metal part or for an unlinked body, and press ENTER. Alternatively, you can select a value that was previously used in the part or a body from the list.
4. Click Apply to continue to configure preferences, or click OK.