HP RC2-5957-000CN cartridge lock lever holder is a printer service part for the cartridge locking lever assembly. It provides the holder component identified for this mechanism in HP printer parts listings.
The M570 MFP internal assemblies diagram lists this exact part number as a cartridge lock lever holder. It is also listed for the HP LaserJet Enterprise Color Flow MFP M575c (CD646A), helping identify its documented printer application.