Features: Thrust Ball Bearing 1 Yield High-speed Performance, 2 True Rolling Motion 3 Application Flexibility 4 Main model: 51100, 51200, 51300, 51400 series 5 Material: carbod steel,chrome steel, stainless steel and ceramic bearing 6 Package: Industrial Exporting Package; upon the customers' requests. 7 Delivery: Upon the quantity, 25-40 days after order confirmation 8 Application: Mine machine, excavator, concrete machine, steel plant, electronic power plant and other machines used in industrial fields.