... best price,timely delivery, 2. superior quality, ISO 9001:2000,long life 3. OEM sevice 4.Gcr15 Chrome steel material ... NamefineStructureDeep GrooveTypeBallBore Size105mm)Outside Diameter190mm)width36mm)Seals TypeOPEN 2Z 2RS Z RSMaterialRing Material Chrome Steel ,Carbon steel,Stainless steelCage material ... price 2.Low vibration3.high rolling accuracy 6221-Z(2Z)-RS(2RS) deep groove ball bearing Gcr15