... , ISO, BV, SGS, IKA, ETCAdvantage:The life time: more than 30000 hoursSamples for testing are available.The more relaxed payment termsDetailed conveyor roller ... 50mm-219mm, length 190-3400mm, which are used in the steel industry, harbor, coal industry, power industry, cement industry, etc2.Tube: Q2353.Shaft: 45# STEEL5.Bearing ...