PT The Bull Dozer II Flat Glass Window Film Installation Tint Tool The Flat Glass Bull Dozer helps you reach hard to reach areas on a flat glass install. The Flat Glass Bull Dozer has plenty of reach and the soft rubber tip on the end insures you won't end up with any scratches on the film. Longer ribs on the Flat Glass Bull Dozer increase the stiffness. Features a 6 inch squeegee blade and is 15 inches in overall length.