... 5mm~8.0 mm Industrial durable belt black conveyor rollerBlack conveyor rollerUsed in mining,cement,steel,harbor,etc. Standard ... , ISO, BV, SGS, etc BrandGoldensunMaterialSteelFinishPainting/Rubber /steel screw/galvanized/CertificateProduct Mark of Safety CertificationManagement systemISO 9001:2000;CEDimensionDiameter ... manufact all kindly of roller idler. Steel carring conveyor roller for belt conveyor