G5-01 Welding Filter.The 3M Speedglas 46-0000-30i auto-darkening filter for the G5-01 Heavy-Duty Welding Helmet features Natural Color Technology allowing you to more readily recognize colors as compared to our other models. This may help you focus on your welding set-up, welding technique, precision grinding, and inspection of just completed welds. When used with a compatible 3M Speedglas Welding Helmet G5-01 Series, meets ANSI Z87.1-2015 high impact.