The Bohler Guardian 50 Auto Darkening Welding Mask is a top-of-the-line helmet that provides welders with the ultimate in protection, comfort, and visibility. It features a large, true colour ADF lens that automatically darkens from shade 4 to 13 when a welding arc is detected, providing welders with a clear view of their work while protecting their eyes from harmful UV and IR radiation. The Guardian 50 is also equipped with a number of other features that make it one of the most comfortable and user-friendly welding masks on the market. It has a lightweight, ergonomically designed shell, a comfortable headgear with longitudinal and angular adjustments, and a smooth ratchet for a secure fit. The helmet also has a grind mode that can be activated with an external switch, allowing welders to grind without having to remove their mask. Features: High Impact Nylon Shell Comfort-Headgear with longitudinal and angular adjustments, smooth ratchet The ADF: Shade 4, 9-13, 50 x 100 viewing area True colour 4 arc sensors CE classification 1/1/1/2 Grind mode via external switch 2 years warranty