Thickened and lengthened rubberized tracks are convenient to open and close with a light press. Tracks are designed to counteract gravity and to slow down the descent with friction. It is stable and not bump along the stairs.stair chair with quick-released strap to move patients up/down the stairs on emergency situation. Never to worry about the safety on moving, advanced than traditional wheelchair, a must-have for old persons or patients.Height: 30.7Width: 20.5Open: 52.8Weight: 31.4 lbsMax. Load cap: 350 lbsLightweight:Easy to use. Head and chest restraints.Sling-style seat cradles individual securely.Foldable Stair Chair:Evacuation Stair Chair is Easily Portable and Travel Sized.3.9 Fold Away Rear Wheels:These Rear Fold Away Wheels have the brakes for operator to easily transport the individual on flat surface to safety.6.3 Front Wheels:These Front wheels allow the operator to easily transport the individual on flat surface to safety.Package Content1 x Stair ChairOur Service:If You Have any Questions During the Purchase or Use, Please Contact Us in Time, We Will be Happy to Help You, Thank You！If you have any questions, We will deliver the goods with in 10-20 working days, please contact us in time for questions such as not receiving the goods we will reply you with in 24 hours, veryYour satisfaction makes us the last wish, I wish you a happy shopping