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The inner cover plate is designed to protect the inside surface of the filter from spark and spatter.
Replace anytime the plate becomes deeply pitted, scratched or too dirty to clean with soft cloth or lens paper.
Regularly clean with a soft cloth and replace if any pits or scratches occur.
The 3M™ Speedglas™ 9000X Series Inner Protection Plate is designed to protect the inside surface of the filter from spark and spatter.