Browse our fine selection of high quality Cast Iron Ball Caps, here. Coming in a variety of shapes and sizes, our Ornamental Iron Ball Caps should be just what you are looking for to put the finishing touches on your stair construction. We have many finishes to choose from on all of our Cast Iron Ball Caps, including unpainted, oil rub bronze, pewter vein, gun metal, semi-gloss black, and many more options. When choosing the right Cast Iron Ball Caps size for your building needs, the hole size refers to the outside size of your material. For example, if you are using 2" square material for your project, you would choose the 2" hole size, so it will slip over top. All of our Ornamental Iron pieces, including our Cast Iron Ball Caps, are made of the highest quality materials and should be your first choice when considering stair construction materials.