When you order a Custom Mounting Board with your order of Sliding Spice Racks, I will contact you once I receive your order to confirm how you would like to configure your spice racks on the shelf. I then laser cut the Custom Mounting Board, apply three coats of polyurethane and attach the hardware for each rack. Simply place the custom mounting board on your shelf, screw in the self drilling screws and slide on your spice racks. you are good to go.