The Ultimate Hook works with the Summit FasTrack System found on Summit's Pro Series treestands. The Ultimate Hook slides into the FasTrack System found on the top rail of the Summit Viper Pro SD climbing stand. Once the Hook is aligned in the position desired on the rail you simply lock it in place and it's ready for use. The Ultimate Hook will hold up to 15 pounds and is ideal for hanging gear, such as a backpack, bow, binos and more. If you don't have a stand with the FasTrack System, the included gear tie will secure the Ultimate Hook to your stands frame.The Ultimate Hook is for Summit Stands with the FasTrack System. This accessory will hold up to 15 pounds of gear. If you don't have a stand with the FasTrack System, the included gear tie will secure the Ultimate Hook to your stands frame.