Wagner Round Black Steel Plant Caddy makes moving plants a breeze. Constructed of solid powder coated steel it has a 220 lb weight capacity! Durable caster wheels makes plants easy to move. Works best with soft floors such as carpet or cork. Caddy has a double ring around the perimeter 1.75"H to prevent shifting and slipping of your pot. Inside diameter is 13" with lip flaring to top of caddy being 15" in diameter. Used indoors and out. 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 quality safety and durability.