G506-815 604 (smooth) and A501-863 STL (serrated, or "Christmas Tree"). Both are used for the 7/8" diameter latches when they are used in a 1" side bore in the door edge. They prevent the latch from shifting in the side bore and causing the handleset or latch to bind.
A501-863 is included as a standard part in Box (Builder) Pack handlesets since 8/29/12, and Visual (Retail) Pack handlesets since 7/22/13.
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