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5Pcs 6004ZZ 20mmx42mmx12mm Double Metal Shielded Deep Groove
N-T-N深沟球轴承6004LLBCM/5K6004LB20mmX42mmX12mm
S-K-F深沟球轴承6004-2RSH/C3两侧胶封20mmX42mmX12mm