item No:31307; PU wheel, 3inch Ball bearing and bushing ... industrial carts ,hotels,foodservic casterItem NO:31307 systemsmaterial: PU Wheel , PP coreBearing:Ball bearing,and bushing, or ... or Lacquer.Load Bearing: Double ball racewaysCASTER/CASTORTYPE: Swivel, Fixed, Swivel with brakeMounting: Top plate, threaded stem, Grip stem ... hospital , hotels and food services universe, swivel ,medical caster