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1PCS Inner Diameter 20mm Non-standard Deep Groove Ball Bearings 20*30*13 32*32*10 20*35*8 Outer Diameter 30 32 35 36 37 38 40mm 1PCS Inner Diameter 20mm Non-standard Deep Groove Ball Bearings 20*30*13 32*32*10 20*35*8 Outer Diameter 30 32 35 36 37 38 40mm 1PCS Inner Diameter 20mm Non-standard Deep Groove Ball Bearings 20*30*13 32*32*10 20*35*8 Outer Diameter 30 32 35 36 37 38 40mm