The NOVA JS100N is one of our most popular chuck accessories to mount 12-14″ bowls. Mount customized false wooden jaws and the customized jaws can be made for special purposes. They are built with a turning dovetail profile to maximize strength without jeopardizing wood fibers, and can hold both in contraction and expansion modes. High tensile 1045 steel makes up the JS100N for precise closing, durability, and a long life. Comes with 4 jaw segments and instructions. Uses the standard fasteners that come with your NOVA Chuck.