The HP RM1-4539-000CN Memory Tag Holder is a tag holder assembly for servicing compatible HP LaserJet printers. HP’s service manual identifies this exact part number as the tag holder assembly and provides a procedure to remove and replace it.
The manual covers the LaserJet Enterprise M604, M605 and M606 printer series. The part is intended for printer repair or maintenance where the tag holder assembly needs replacement. The documented procedure calls for a #2 Phillips screwdriver with a magnetic tip, a small flat-blade screwdriver and a short-shaft screwdriver.