Ball bearings from the well-known manufacturers: SKF- Sweden. FAG- Germany. NKE- Austria. Premium quality. Replacement deep groove ball bearings. 2RS = plastic shield on both sides is protected against splash water and dust. 2Z (ZZ) = metal shield on both sides is protected against dust. C3 = increased internal clearance. NR = Groove in outer ring with snap ring. M = Brass cage. DIN 625. (Other types on request. Prices for larger quantities on request)