For the price, this closet system can't be beat. The rail must be bolted to 2/4 with two - 2 1/2 inch wood screws on each 2/4, those are not included. Mount all shelves with included wood screws and skip the metal pins for stronger construction. Also, mount hang rods to the plastic holders by drilling holes and putting screw, trust me it'll be worth it. Also consider bolting the side panels to the wall (to 2/4) to maximize overall holding capacity (keeping in mind that shelves will have to be assembled first, then hanged as there will be no access to screw hole on the side because of the wall)