Genuine Konica Minolta Document feederĀ Cover Release Knob for optional document feeders DF-621, DF-624, DF-628, DF-629, DF-701,DF-704 and standard feeder for bizhub 454e, bizhub 458, bizhub 554e, bizhub 558, bizhub C454, bizhub C454e, bizhub C554, bizhub C554e.