The automatic rewinding safety straps on Escalera Stair climbing Hand Truck work the same way as a seat belt in a car. They can be mounted at different heights on hand trucks and can easily be used to secure the heaviest of loads. The Automatic Rewind Strap for Escalera Hand Truck is lightweight, and self-contained. Because they rewind into the side frame when they are not in use, you will never have loose straps dangling down by your feet. A simple to use thumb-style lock secures the strap for tightening. Every Escalera Stair climbing Hand truck ships with one automatic rewinding safety strap included as standard. Additional straps are optional.