Application: suitable for placing heavy objects such as refrigerator, sterilizing cabinet and air-conditioner •Feature: maintaining ventilation of the bottom of the objects, anti-moisture, anti-rust, and easy to be moved and cleaned •Material: PA66 rubber universal wheels, metal zinc-plating tube •Function: smooth and firm, adjustable dimension and convenient movement •Quality: Ultra-strong rigidness, press resistance, and anti-corrosion •Height: 10 cm •Maximum load: 138kg •Maximum Stretch: 56cm x 56cm