For Bored/Cylindrical locksets conforming to ANSI A115.2. The 161 Prep is a cylindrical lock prep with a bore diameter of 2 1/8” The edge of the door will have a 1-1/8″ x 2-1/4″ edge prep to account for the latch of the lockset. The 161 prep will fit most cylindrical locks that have a 2-3/4” backset option.
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