These extended jaws act like a pin chuck, expanding into a pre-bored hole. A useful technique for free form edge bowls as you don’t have to bore an exact size as with other pin jaws. The longer jaws allow for a very powerful spigot grip for smaller work. Also features a small dovetail. Expansion 26 – 46mm Contraction square: 28 – 7mm Contraction spigot 31 – 10mm