This RAM Mounts Quick-Release holder is suitable for Zebra ZQ521 Series.This holder is not compatible with the printer accessories for the Zebra ZQ521 series.The back of the device holder is prepared to support a diamond ball base (not included).Product features RAM Mounts RAM-HOL-ZE30U:Quick-Release for easy insertion and removalAdditional information: Devices shown are not included in the delivery.Only the RAM-HOL-ZE30U holder is supplied.