Used to attach internal lifting cords to the bottom rail of some types of cellular honeycomb and pleated shades manufactured by Alta, Comfortex, and Custom Brands Group.

Easily adjusts with a coin or flathead screwdriver to level the shade quickly.

Works with 0.9mm string only. 

Sold as a set. Each set includes one insert and one base.

Clear plastic.

Hunter Douglas part # 12-128A & 12-129A. 

This video shows how to install and adjust this part.