**Alarm Lock cylindrical locks, such as the Trilogy DL2700, DL2800, DL3000, DL3200, PDL3000, DL5300, PDL5300, PDL6100, PDL6200, DL6100, DL4100, and PDL4100, all include a 2 3/4″ cylindrical backset. When your measurement is 2 3/4″ you do not need to order this part.
Cylindrical backset required for doors with 2–3/8\" distance from the edge of door to bore hole.