S61902-2RS Stainless Steel Sealed Ball Bearing 15mm x 28mm x 7mm S61902-2RS Stainless Steel Sealed Ball Bearing, S61902-2RS bearing is a popular size that could be used in many application that uses this size 15mm x 28mm x 7mm,6902-2RS bearing has 2 built-in rubber seals to protect the bearing from dust or any possible contamination, 6902-2RS is a made of stainless steel, some bearing manufacturers call this bearing SS6902-2RS, 6902-2RS bearings are packed already with grease, 6902-2RS seals can be removed and reinstalled.