2" x 4-1/4" Clear Long Life CR-39 Polycarbonate Blackstone® Cover Plate UNSPSC 46181811 Manufacturer Fastenal Approved Vendor Brand Blackstone® Product Attributes Length 4-1/4" Width 2" Model Compatibility Fits Most Welding Helmets Shade Clear Type Cover Lens Material Polycarbonate Specification ANSI Z87.1-2003 Notes Polycarbonate Material The CR-39 coating provides better scratch resistance and a longer life. CR-39 material provides better scratch resistance and longer life Protects filter plates from pitting and scratching Durable, heat resistant material Meets ANSI Z87.1-2003 Standards
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