Wagner Adjustable Plant Caddy is made of rust-proof metal with soft wheels to protect floor from damage. Feet extend to create base from 10 inches in diameter up to 15.4 inches. Reinforced center for extra strength and stability. Rubber stops to keep plant in place. Use indoors or out! 220 lb capacity. The Wagner company located in southern Germany near the Black Forest has earned a reputation for exceptional quality. With over 40 years experience in design and manufacturing their products are rigorously tested for safety and durability.