... , C4, C55)Material: AISI52100, AISI440C, AISI304, AISI316, Ceramic6)Retainer: PTFE, Nylon, PEEK Or Stainless Steel Name:Deep Groove Ball Bearings of ... .281……………………68201003.93711254.9213130.51180.6686828………………… high-quality / 6800 series / Thin-walled metric bearings