4″ Pot, 10.5″ Tall, Metal planters are constructed of steel with a painted coating. . The planters do not have drainage holes so that they may be used indoors. Use a hammer and nail or a drill to add drainage holes. The rings on the large planters will also hold a clay or terra cotta pot. A protective coating may be sprayed on to preserve the finish. No Tools are necessary for assembly. Made for indoor and outdoor use.