... delivery, good service 4. 20 years supply stainless steel ball bearing1. High precision 2. ISO9000 Quality 3. Quick delivery, good ... SKF, etc.2. high precision, long life, low noise3. material: high chrome, carbon steel, stainless steel, etc,4. Retainer: copper ... cage, nylon retainer, steel retainer5. Sealing form: OPEN, Z ...