Master Series, Patriot, Auto Darkening Welding Helmet, Largest Viewing Area, Best Optical Clarity, High Impact Resistant Nylon, Internal Shade Selector, 5 Point Adjustable Geared Headband With Sweatband Mechanism, 9.144 SQIN, 3.81" x 2.4", Large Viewing Area, Din 5 To 8 Cutting, Low Current Welding: Adjustable Shades 5 To 9 For TIG Process Low Intensity, Oxyacetylene Welding - 9 To 13 Variable Shade Selection TIG Operable To 5A, 4 Optical Arc Sensors Optimize Arc Detection & Reduce The Risk Of Blocked Sensors During Out Of Position Welding Detection, 1/1/1/1 Optical Clarity Rating, 1/20,000 Per Second Switching Speed.