... , 2RS, 2RZ2. Bearing stop ring: N,NR 3. Class of precision: ABEC-1, ABEC-3, ABEC-5, ABEC-7 4. Vibration ... 5. Noise rank: Z1,Z2,Z3,Z465.6. Internal elimination code: C0, C2, C3, C4, C57. Bearing material: bearing steel (9Cr18 ... .We will give you our best products with competitive price. HIGH PRECISION URC BEARING