... 3. Bearing name :Deep groove ball bearing4. Number of row :Single row or double row5. Material : Chrome steel ,stainless steel ,bearing ... type: open, Z, ZZ, RZ, RS,2RS 7.High precision, low noise 8. Material: Gcr15, Gcr15Simn, G20Cr2Ni4A, Gr18Mo 9. Outside diameter: 3 ... , agricultural machinery, construction machinery, construction machinery, and so on. No-noise Deep Groove Bearing Cage