The CargoSmart Retractable Ratchet Tie Down Strap for E-Track and X-Track is used to secure your cargo when hauling it in an enclosed truck or trailer. It works just like a normal ratchet tie down strap, but the spring-loaded fittings on the ends connect to both E-Track or X-Track rail anchoring systems. It features overmolded, ergonomically designed handles for optimal performance and a built-in power spring that retracts loose webbing at the push of a button, just like a tape measure. The straps are permanently attached to the ratchet housing so the ratchet is fully self-contained. No tools required for installation.