This is a device that holds your accessories in place, whether it be a cargo carrier, a simple ball mount or one of your bicycle racks. Also as a note this is not a free standing device, this part does need to be bolted against the wall to keep it in place. Your accessories mount on pretty much like a regular hitch pin. Slide your accessory on, and put your hitch pin back in for security. As you can see we have one ball mount stored in place and ready to go. Now you will notice the pin on the other side, we can install another device like a ball mount, in this case we will use a bike rack. There you have it, you can store two devices at the same time. As you can see we installed a couple of two inch accessories, also available are different pins or docking stations that you can install for a different type of bicycle racks for a 1-1/4 hitch or racks that use a threaded insert, there are provisions for those too. That is for the Boone dock two inch storage stand, part # BH91411.