ENDURO DR21531LLB Double Row Angular Contact Ball Bearing with Low Friction Seals 21.5x31x12mm

Enduro Double Row Type Rubber Sealed Deep Groove Ball Bearings: These are double row series bearings are angular contact at 15º with 2 rows of balls opposing each other. Typically found on cycle cranks. These types are manufactured with rubber seals inserted into the outer raceway and in contact with the inner race providing protection against the ingress of moisture, dust and other foreign matter and serve to retain the pre-filled grease in the bearing.
Seals: Seals can be easily removed for applications that only require 1 seal.
Benefits: Prevents moisture and dirt getting into the bearing, lubricated for life, maximum load capacity