6811LU Sealed Ball Bearing 55x72x9mm6811LU Sealed Ball Bearing 55mm x 72mm x 9mm 6811LU is double sealed, radial and deep groove ball bearing, bearing is made from Chrome Steel with chrome steel balls and steel cage, 6811LU bearing is closed with rubber seals to protect the bearing from dust or any possible contamination, 6811LU bearing is sealed and self lubricated with grease. 6811LU Ball Bearing Deep groove radial ball bearing Cage: Steel Balls: Chrome Steel Material: Chrome Steel