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.
Regularly clean with a soft cloth and replace if any pits or scratches occur.
For 3M™ Speedglas™ Welding Filter Series 100 and the older welding filter models: 9002D/9002V filters. Size 42x91 mm. Plate marking 42 02 00, pkg of 5.