... roller dia 60-219,length 190-3400,used in mining,cement,steel,harbor,etc. Standard:ISO,CEMA,DIN,JIS ... 190-3400mm, which are used in the steel industry, harbor, coal industry, power industry, cement industry, etc2.Tube: Q2353.Shaft: 45# STEEL5.Bearing ... painting, baked paintingBesides we can manufacture the rollers and idlers according to the buyers' requirements conveyor belt for coal mining industry