Display your ammonites with a touch of class and sophistication. These are not mass produced. Each is hand poured from a master that was meticulously carved. Both stands have the ability to hold the same diameter ammonite, but this stand is a just a bit taller to accommodate the seahorses. A 7-8 inch ammonite or nautilus shell will fit comfortably. The prongs that hold the ammonite are adjustable.