Equipped with optics that enhance detail, contrast, and color, Speedglas™ Auto-Darkening Filter (ADF) Kit 9100XXi improves experience for welders using 3M™ Speedglas Welding Helmet Series 9100. External grinding feature lets welders seamlessly switch into grinding mode. Also, welders can access 2 pre-set welding modes via external button on helmet's silver front panel; removal of safety gloves or helmet is not required. Grab and go feature automatically turns welding filter on to last setting.