... :C0,C2, C3, C4, C5 1)Shield / closure: Open,Teflon Sealed,Rubber Seals,2 Metal Shield2)Tolerance codes: ABEC-1, ABEC ... : PTFE, Nylon, PEEK Or Stainless Steel Name:Deep Groove Ball Bearings of 68 SeriesIntroduction: Bearing numberBore(d)O.D(D)Width ... .2336813652.5591853.3465100.39370.281……………………68201003.93711254.9213130.51180.6686828………………… high-quality / 6800 series / Thin-walled metric bearings