This chart holder trolley is made of stainless steel and ABS material which allows it more reliable and durable for people to use. It is corrosion-resistant and easy to clean. It combines a drawer with the key lock and 25 layers with a central lock. Each layer is identified by numbers so nurses can clearly and quickly take out the patient's charts. It also features 4 swivel casters that people can easily approach and control it when it is in need.