The ArcOne Singles 240 Retro-Fit Auto-Darkening Welding Lens is a high-quality protective gear for welding professionals. With a 2" x 4-1/4" size and a shade 10 filter, this lens is designed to provide optimal protection and visibility during welding tasks. The solar-powered auto-darkening feature ensures that the lens is always ready to adjust to the brightness of the welding environment, while the fixed shade lenses maintain a consistent shade level for improved comfort and safety. This retro-fit lens is a reliable and efficient addition to any welding helmet, offering durability and reliability in various industrial settings.