... 2.Lens Thickness: 2.2mm 3.Idea for metal polishing Polycarbonate Night vision goggles ( Our model No. SG9000 )DescriptionMaterial: High quality PC & PlexiglassLens Thickness ... .2mmAanti-impact, Anti-splash, anti-scratch Features Full eye protection Night vision goggles, anti-impact, anti-splash, anti-scratch Idea for metal polishing ...