3M Hornell Speedglass auto darkening welding helmet. Model: 9100 # 06-0100-30SW with Side Windows These helmets are NEW and never used. 3M Speedglas Helmet 9100 with Auto-Darkening Filter 9100XX, 06-0100-30SW 1/Case Extra Extra large 4.20 in x 2.8 in (107 mm x 72 mm) viewing area and advanced electronics to handle a variety of welding processes, including extremely stable, low amp TIG arcs. Helmet has four exhaust vents for reduced stuffiness. Side Windows built into helmet. Additional Information: Complete package, including helmet, headband and auto-darkening filter. For welders handling a variety of amperages and different arc welding processes. The 9100XX has clear, sharp optics and consistent shading across its entire large viewing area. Battery life: 2,000 hours 2 X CR-2032)