NOVA 8312 Infinity Accessory Jaw - Saw Tooth Series #2 Infinity Saw Tooth Chuck Jaw designed for aggressive holding of spigot (tendon) turnings like goblets, hollow form vases &amp; urns Saw Tooth jaw best profile for a solid grip on spigot. Capacity overlaps with #1 &amp; #3 Saw Tooth Jaws Ideal for longer vases and other hollow form work with both infernal &amp; external saw tooth grip available Stronger, more rigid grip for vases and hollow form turning than traditional Nova Jaws Also has external/internal dovetail to mount bowls to provide extension away from chuck face so inside/outside of bowl can be turned