1) Applicable to PCB, stainless steel sheet, film for dusting; 2) Sizes: 1", 2", 4", 6",8", 10", 12" ... products produced by the process of small particles, impurities, fiber, copper scrap, dust etc., to improve the yield of electronic products.2 ... roller rotate freely.3,Applications: .PCB, stainless steel sheet, film for dusting; clean roller drain cleaning machine