... mining,cement,steel,harbor,etc. Specifications:alibaba China impact roller/idler manufacturer 1.Dia 60-219mm,length 190-3400mm ... payment terms4.Dustproof&waterproof alibaba China impact roller/idler manufacturer Detailed:1.Roller idlers Dia 50mm-219mm, length 190-3400mm ... , etc2.Tube: Q2353.Shaft: 45# STEEL4.Bearing: Single & Double Row Deep Groove Ball Bearing 2RZ&2Z with C3 clearance.5.Seals: Grease ...