Interior Trim Pack Functions:
978 Interior Trim Pack - is compatible with 553
Montara series handlesets which use a
single cylinder deadbolt that is operated with a key from the exterior and a thumbturn from the interior.
979 Interior Trim Pack - is compatible with 554
Montara series handlesets which use a
double cylinder deadbolt that is operated with a key from both the exterior and interior.
Door Handing: 
Select preferred finish (3 finishes available); door handing; and function (2 functions available) to view detailed product information.