SKF 6308ZC4M Single Metal Shielded Deep Groove Ball Bearing 40x90x23mm

Metal Shielded Deep Groove Ball Bearings: One of the most commonly used bearings, these types are manufactured with metal shields inserted into the outer raceway, these fit in closely to the inner race providing protection against light mechanical damage, some protection against the ingress of moisture, dust and other foreign matter and serve to retain the pre-filled grease in the bearing.
Note: This bearing has one metal shield.
Benefits: Provides light mechanical protection, limits moisture and dirt ingress, lubricated for life, cost effective solution