... Rizhao City , Shandong Province. The main products are belt conveyor, bag filters, and belt conveyor accessories, including rollers, pulleys and roller frames, ... conveyor roller is our main products.1 .Roller Diameter:50-219mm. 2 .Roller Length: 190mm to 3500mm . 3. Roller tube: Q235 seamless ... pressure sameness, so the roller turn unimpeded . steel belt conveyor return roller for heavy duty industry