3M 776000 100 Series Outer Protection Plate 10-pack Features Speedglas 100 outer protection plate is designed to protect the filter from sparks and debris. If an outer protection plate is not used with the filter, the warranty will be void if sparks or splashes dirty the lens. The plate should be replaced when deeply indented, scratched, or dirty. It can be cleaned with a soft cloth or lens paper when dirty. If deeply scratched or excessively dirty, it should be replaced. An outer protection plate must be used with the filter to avoid voiding the warranty. Compatible Products Speedglas 9100, Speedglas 9100 Air, Speedglas 9100-QR