To Display Model Size
1. For an assembly, in the Model tab, click > 
Model Size.
Model Size.For a part, in the Tools tab, click > Model Size.
Model Size.2. In the graphics window, select the model (component) that you want size information about. The length of the bounding box diagonal for the assembly appears in the Message window, and the bounding box appears in green around the selected model.
If you are in part mode, the length of the bounding box diagonal appears in the Message window and the bounding box appears in green around the selected model.
 | To remove the bounding box, repaint or rotate the model. |