Forney 57056 Lens Replacement Non-Hardened Glass, 4-1/2-Inch-by-5-1/4-Inch, Clear Replacement welding helmet cover lens High quality material offers superior protection from dust, weld spatter and impact Fits most brand name helmets using 5 1/4-Inch x 4 1/2-Inch window opening Meets ANSI Z87.1 safety standards