S6004-2RS Stainless Steel Sealed Ball Bearing 20mm x 42mm x 12mm S6004-2RS Stainless Steel, Sealed, radial, and deep groove ball bearing,S6004-2RS bearing is made of Stainless Steel and Stainless steel cage,bearing is closed with rubber seals to protect the bearing from dust or any possible contamination,S6004-2RS bearing is sealed and self lubricated,bearing is lubricated with grease.