--This stretcher has three-step and two wheels of big and small according to any height of ambulance carriage bottom board. --The bed surface of the stretcher is made of foamed cushion, the material is waterproof, the back part are adjustable which makes the wounded feel comfortable. --The stretcher with safety lock, it must be locked up when transport the patients, and opened out when get on the ambulance. --The mechanical folding legs are controlled by the handles on both sides. Only one person can send the patient(with this trolley) to the ambulance. --The stretcher can be locked up after being aboard through the chute. --It is made of high-strength aluminum alloy materials. It characterised by its being light-weighted, use-safely and easy for sterilization and clean. --Its mainly used for hospitals, ambulance and city roads carrying patients and wounded person. --The size of castor: 150mm