Kirsch Architrac 94004 Easy Ceiling Mount Curtain Rod for heavy duty use. This track system has an extended ledge on the back for installing in the ceiling. The other ceiling mount Kirsch Architrac Systems use pre drilled holes in top of the track. These require installation via the track where the drapery carriers traverse. It requires precision installation to avoid bumping the screw drill against the track where the carriers traverse. This will not prevent the tracks from working, but can cause a less smooth operation. Ths Architrac 94001 System avoids this as all installation is outside the inner part of the track.