Xerox 607K00051 Feed and Separator Roll Kit is a paper tray roller kit for feeding sheets into a printer and separating them during pickup. The service parts list identifies it for the Phaser 6510 and WorkCentre 6515.
The kit listing also names VersaLink C500, C505, C600, C605, B600, B605, B610 and B615 as compatible printer families. Its parts are two 859K00100 feed/nudger rolls and a 019K17070 separation/retard roll assembly with a one-way friction clutch. Together, these components handle paper pickup and separation from the tray.