The Sundial Shell finial averages three inches tall. Sundails are sometimes called the winding-staircase shells. They are a small group of gastropods (mollusks that create a single shell) that live in warm water regions. These shells were found across the Indo-Pacific region. This stretches from the Indian Ocean East across Northern Australian/New Zealand shores to just South of the Sea of Japan. As with all of our finials, the shell is mounted on an independent swivel, so it can be spun to any position.