Size: B 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. Technical features: The stretcher is made of high-strength aluminum alloy material and is a separate rigid structure a clutch device is arranged at both ends to separate the stretcher into two parts The stretcher can fix the patient in situ and reduce the secondary injury to the patient The length of the stretcher can be adjusted in the third gear according to the length of the patient It can be equipped with a head fixer it is mainly used for hospitals, stadiums, ambulances to transfer fractures and seriously injured patients. Model Expand Size Fold Size Net Weight Load Size Size Gross A 214×42x7cm 167×42x7cm 9kg 159kg 1 170x43x7cm 10kg B 214×42×7cm 167×42x7cm 9.5kg 159kg 1 170x43x7cm 11kg 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, very Your satisfaction makes us the last wish, I wish you a happy shopping?This product is a comfortable cushion with a foamed curved handle and two safety belts to ensure the patient's safety during the transfer process. ?Safety Assurance - Head and chest restraint. Securely strapped through the chest, one attached to the forehead, securely securing the individual to the chair. ?Lightweight and easy to use - Aluminum stair stretchers are primarily used to evacuate patients from multi-story buildings. ?Convenient transfer - 3.9" Folding rear wheels: These rear folding wheels have brakes that allow the operator to easily transport individuals on a flat surface to safety. 6.3" Front wheels: These front wheels allow the operator to easily transport personal flat surface safety . ?One person operation down stairs (less than 159 kg) - Under normal circumstances, the patient can be lifted by one person. If the patient exceeds 159 kg, there are 2 or more operators.