Kit includes 1 metal backing plate and hardware kit (you supply front half of RotoPax brand mount/handle and lock). Turn your rack or ladder into a mounting point for your RotopaX gas or water packs. This RotopaX backing plate consists of laser cut, thick steel that's heavy duty and comes with longer, more durable mounting hardware to fit the standard mount for your RotopaX gas packs. With longer hardware than what comes standard with your RotopaX mount, you can mount your packs to different racks, crossbars or ladders. This kit allows you to mount your RotopaX to tube or square iron that's up to 1-1/2" thick. A great way to mount to the crossbars on your Yakima, Rhino, or Thule racks. Perfect for Gobi ladders, or Baja Rack ladders. And you can stack mount multiple packs without compromising durability.