Replacement "Gold Coated" 4-1/4" (107.95mm) x 2" (50.8mm) glass welding filter lens. For prolonged periods of welding and/or to see true flame arc and puddle color. The gold coating reflects 90% of radiated heat for cooler operation and less eye fatigue. Provides UV/IR protection. Meets ANSI Z87.1 Safety Standards. Fits Forney 55663 ("Slim Line"), 55666 ("Bandit I"), and 55680 ("Super Slim") welding helmets and most brand name helmets using a 4-1/4" (107.95mm) x 2" (50.8mm) window opening.