Diameter of the Large Bore Hole (for the Spindle): Diameter of opening for the flat spindled (aka "tail piece") 1/2″ to 2-1/8″ Distance From an Existing Deadbolt: To install this deadbolt keyless lock underneath an existing deadbolt, allow at least this distance from the bottom of the existing deadbolt to the middle of the large hole for this lock. call for details To install this deadbolt keyless lock above an existing deadbolt, allow at least 2-3/4 inches from the top of the existing deadbolt to the middle of the large hole for this lock 2-3/4 inches
Diameter of the Large Bore Hole (for the Spindle):
Product 2/9