667 One Sided Deadbolt with Exterior Plate - is operated by a thumbturn from the interior and includes a blank plate on the exterior (663 + 664 = 667).
663 One Sided Deadbolt - is operated by a thumbturn from the interior. No trim on exterior.
664 Exterior Plate - is combined with one-sided deadbolt when door is bored through. Blank plate for exterior side only.
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