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- R4 ZZ Bearing 6.35x15.875x4.978 mm
- Miniature Ball Bearing Size: 6.35 x 15.875 x 4.978 mm Chrome steel with Z2 quality
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- R3 ZZ Bearing 4.763x12.7x4.978 mm
- Miniature Ball Bearing Model : R3 ZZ Size: 6.35 x 12.7 x 4.978 mm Material: Chrome steel Quality : Z2 (ABEC-2)
