R1212-2RS Ball Bearings Rubber Sealed 1/2" x 3/4" x 5/32" inch Lot of 10 Bearings R1212-2RS Sealed Ball Bearings, this is a popular size that could be used in many application that uses this size 1/2" x 3/4" x 5/32" inch. Each bearing has 2 Rubber Seals to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease.