Glass Ball End Caps are small, decorative metal pieces designed to fit over the lip or opening of a glass lightning rod ball. These caps come in various sizes to accommodate balls from any era. Our brand of glass balls come with 5/8" X 1.25" caps, but all the caps sold on our site are compatible with our glass balls. Please note, you will need to purchase waterproof silicone from an external supplier to attach the caps to your glass ball securely. We also offer glass balls with caps already attached. Currently, only the sizes listed in our menu are available, with no additional sizes offered at this time.