... roller bearing 1. Good quality 2. High precision and long life 3. Quickly Delivery NU304ECP Cylindrical ... MR4. Clearance: CN, C2, C3, C4, C55. Precision level:ABEC-1,ABEC-3,ABEC-56. Main application: ... machine,Highway engineering machinery ,Sewing machine,Textile machinery, Electric tools,Agriculture machinery , industrial washing machine , Washing Machine,mining machinery,foundry machinery, oilfield ...