These sturdy, one-piece molded mobile containers are made of high-density polyethylene (HDPE). Ideal for storing and handling both solids and liquids. Caster frame gives complete mobility regardless of load. Removable casters are 3'' dia for smooth rolling. Containers easily separate from the frame for cleaning. Include one-piece molded HDPE cover with recessed hand knob. NSF certified; USDA approved.