... prices and stylish designs, our products are extensively used in cement, electrical power, mine, port, building materials ... 3. Roller tube: Q235 seamless carbon steel. 4 .Color: Black, red and grey. 5. Painting: ordinary painting ... Certificate 1.The best conveyor idler and roller in China.2.China famous roller brand "HAIHUI" 3.Third party ... conveyor roller with frame passed ISO9000 in machinery in china