It works by sliding the back gate up or to the open position, attaching it to your gear and then sliding it on the belt in your designated spot. You then close the gate and your gear is secure until you decide to remove or relocate its position. It is black anodized for the subdued look as well as corrosion resistant. Four (4) to a pack. This is the choice system of Wildland Firefighters because of its fail-proof design, lightweight construction, and low cost.