... OEM. 2. Good quality bearing ball. 3. Bearing ball, of long life, with high precision. 1) Bearing ball: Special 629 bearing ball of high precision ... equipment.5) Number of row: Double rows.6) Bore size and outside size: Standard size.7) Precision rating: P0, P6, P5, P4, P2 ... according to your request.9) Packaging: Wooden package, carton package. Special 629 bearing ball of high precision