3M Speedglas 9100 Series Welding Helmets offer available Auto Darkening Lenses with seven variable dark shades (5, 8 and 9-13) for most types of arc welding.3M Speedglas 9100 Series Welding Helmets offer available Auto Darkening Lenses with seven variable dark shades (5, 8 and 9-13) for most types of arc welding. Available in multiple models with various viewing area sizes. With or without side windows. Compatible with most 3M Safety Spectacles and/or 3M Disposable or Reusable Welding Particulate Respirators. Ergonomically-designed head suspension.