Replacement parts for the Surly cargo deck and rack system. Features: Works with Surly cargo frames including the Surly Big Dummy, Big Fat Dummy, and Big Easy Deck-attachment bosses stick up from the rails to create space between the deck and rails, providing windows to route tie-down straps and cordage Threaded bottle cage bosses located at the rear of each rail provide mounting locations for accessories Made of light, strong aluminum and were designed in conjunction with the Dummy Deck and Dummy Bags