The only addition to any tie down system you will ever need for your Gobi rack. The Delta hook was designed specifically for expanded metal decks. The easy to use 3/8" zinc plated and Thermaplastic coated steel Delta hook slides between, and under, the expanded metal deck to serve as an anchor to attach your tie down S-hook. This uniquely developed hook can be positioned in any direction for the best possible use. Comes with easy to follow instructions.