SER207-20 is a SER200 Series Set Screw Locking Bearing Insert Ball Bearing with a Snap Ring and Grease Feeding Access. This SER207-20 Insert Bearing has two set screws which allows it to tighten against a shaft once it is fitted properly and a grease feeding groove for re-lubrication of the bearing. Our SER200 Series Insert Bearing features a snap ring which facilitates the axial location of the bearing in its housing and each of our inserts have been pre-lubricated with grease, allowing them to be ready for use upon arrival.