Budget Metal Shielded Deep Groove Ball Bearings: Oneof the most commonly used bearings, these types are manufactured withmetal shields inserted into the outer raceway, these fit in closely tothe inner race providing protection against light mechanical damage,some protection against the ingress of moisture, dust and other foreignmatter and serve to retain the pre-filled grease in the bearing.
Shields can be removed for applications that only require 1 shield
Benefits: Provides light mechanical protection, limits moisture and dirt ingress, lubricated for life, cost effective solution