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PSA-335 No.4 Backing Cloth Only for Porta-Screen Tray with No.100 to No.400 (150 to 38µm) wire cloth. The backing cloth prevents damage and stretching of fine mesh, and extends service life. The sturdy No. 4 (4.75mm) stainless steel wire cloth is exclusively built for use as reinforcement, and features flat-rolled surfaces to prevent abrasion of finer cloth.
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