6211DU Sealed Ball Bearing 55x100x21mm6211DU Sealed Ball Bearing 55mm x 100mm x 21mm 6211 DU Sealed Ball Bearing, 6211DU bearing is made from Chrome Steel, 6211DU bearing is closed with rubber seals to protect the bearing from dust or any possible contamination, 6211DU bearing is self lubricated bearings, 6211DU bearing is already greased. 6211DU ball bearings Deep Groove Ball Bearing Closures: Rubber Sealed Material: Chrome Steel Size: 55mm x 100mm x 21mm Inner Diameter: 55mm Outer