China Supplier belt nveyor carrying roller idler and idler roller Detailed nveyor roller feature: 1.Roller idlers Dia 50mm-219mm, length 190-3400mm, which are used in the steel industry, harbor, al industry, power industry, cement industry, etc 2.Tube: Q235 3.Shaft: 45# STEEL 4.Bearing: Single & Double Row Deep Groove Ball Bearing 2RZ&2Z