Deep Groove Ball Bearing R8-7 1.ISO9001:2008 2.High precision,long life,low noise ... :About the products: Product Name: Deep groove ball bearing R8-7 Dimension And Parameters Bore (d)mm inchOuter diameter (D)mm ... ABEC-1(P0), ABEC-3(P6), ABEC-5(P5), ABEC-7(P4)Greese/OilAs you requirement, such as SRL ,PS2, Alvania ... .ballbearingcorp.com Inch R Series Deep Groove Ball Bearing R8-7