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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