Replace your original protection plate if it becomes pitted or scratched, with 3M Speedglas Outer Protection Plate 9000, 426000. Our outer protection plate replaces worn or damaged parts and ensures you maintain the correct level of comfort and protection. When your original plate becomes deeply pitted, scratched or too dirty to clean with a soft cloth, it's probably time to replace it. Make it a habit to check your equipment regularly for maximum comfort and vision. Failure to use an outside protection plate with the filter voids the warranty if spark or spatter contaminates the glass. Pack of 10.