The 150mm (6”) squeegee and trimming guide is the tool for multiple uses, it can be used at the initial cleaning of the glass stage, then as part of the expelling out the water between the applied window film and the glass, use with the trimming knife it can be used as a guide against the edge of the window frame to ensure a neat cut of the window film. It is offered as part of the basic tool kit or as an individual tool item.