Download the plugin and install IGES Importer plugin for SketchUp.
Run SketchUp and Load a model.
Open extensions ribbon, click import.
It contains following four ribbon buttons as shown in the image below.
Importing models into SketchUp can be done with real design dimensions, by unchecking the Auto scale Imported Model option in the Advanced Settings window. This window can be
accessed by clicking the Settings option in the plugin sub-menu.
On the other hand, if a user needs to import a model to complete a scene, checking the Auto Scale Imported Model option will scale the model according to the scene's dimensions.