Limited fit capabilities.   Be careful and measure your application.  Mine was a 2x4 rail with 3/4 inch stockade type wood slat as a face totaling 4 inch plus 1 inch (or 3 5/8 plus 3/4 inch=4 1/4 inch actual fit). The box only adjusts to 4 inches (maximum). The slides adjust to 1 inch graduations. I had to modify.  Other than fit, the unit is nice.