Hardened welding lens. Meets ANSI Z87.1 safety standards. Fits "Forney" 55663 ("Slim Line"), 55666 (Sku # 891.0069) and 55680 ("Super Slim") welding helmets and most brand name helmets using a 2 in (50.8 mm) x 4-1/4 in (107.95 mm) window opening. UV/IR protection.
