Ceramics / Hybrid Stainless Steel Deep Groove Ball Bearing SS C 63801 ZZ 12x21x7 mmTechnical Data Inside Diameter (mm): 12 Outside Diameter (mm): 21 Width (mm): 7 Rows Of Balls: single row Slot & Snap Ring: no Seal: ZZ Flange: no Ring Material: Stainless Steel Rolling Element Material: Ceramics Cage...