All Cunningham ™ planters are constructed with the following components; Top Rim: 3/4” Diameter Steel Rod; Vertical Straps: 5/8” Diameter Steel Rod; Base: ¼ x 2” Flat Steel Bar. The best kinds of planters are the ones you don’t have to think about, aren’t they? That is exactly what we manufacture at Thomas Steele. We make them simple, we make them sturdy, and we make them attractive with a variety of styles and materials to coordinate with your other Thomas Steele furnishings. This steel planter box is a handcrafted, high-quality furnishing that is sure to enhance any space.