The Grainger 18"W x 35-1/4"D x 35"H Round Rolling Containers are made of high-density polyethylene with a load capacity of 500 lbs. They have a round shape for easy mobility and feature a nesting design to conserve space. The containers have a reinforced ribbed base for strength and 4" casters (2 fixed and 2 swivel with brake) for easy rolling. They come in a variety of colors including blue, gray, green, orange, red, yellow and are ideal for use in industrial, maintenance, janitorial, retail, auto service, warehouse and healthcare settings. These heavy-duty containers can help transport parts, tools, waste, laundry and more efficiently.