What is a Divider Bar / Lock-Rail?

A Divider Bar or Lock-Rail (as we call it!) is a horizontal rail that divides the tilt-rod and louver slats in two. Having this rail inserted in the shutter panel allows you to operate the top and bottom louvers independent of each other. Lock-Rails are a great way to allow light in from the top while ensuring privacy on the bottom. They also add strength and stability to tall panels.