The product description states that you need two of these kits to install an 84" rail. The rail installation instructions state that you must drive 6 bolts to achieve the maximum load capacity for an 84" rail. You should also use drywall anchors between the studs. Use 2 screws for each mounting location. So that's 12 screws for 6 studs and 10 screws and drywall anchors between the studs for a total of 22 screws and 10 anchors. Each of the hardware kits I received contained 11 screws and 4 anchors so 2 kits contained 22 screws and 8 Anchor It's 2 anchors shorter if you follow the instructions. Luckily one of my kits had 5 anchors. Also, I bought 4 sets to install 2 84" rails so I can steal the anchor from the 3rd set. But now I have to make a journey to get more anchors. Obviously not a big deal but kind of a PIA because it means I won't be able to install all of my rails this weekend. B&D should include enough parts to allow installation as recommended.