NOVA JS75DT Step Chuck Accessory Jaw Set is an accessory for NOVA Chucks, designed to expand your range and capacity of your standard NOVA Chuck for specific projects and applications. Universally fits to any NOVA Chuck for maximum flexibility, saving money as duplicate accessories are not needed for different NOVA Chucks. The NOVA JS75DT Step Chuck Accessory Jaw Set has three step sizes providing optimum gripping of 3 base (foot) sizes with minimal crush damage to wood. The optimum step sizes are 1.65, 2 in., 2.5 in. With a special NOVA wood turning dovetail profile, designed specifically for maximum strength and holding in wood turning, without crushing the wood fibers. These jaws will hold in both the contraction and the expansion modes. Precisely machined from a single solid piece of 1045 high tensile steel for precise closing, durability and long life. Comes with 4 jaw segments and instructions. Uses the standard fasteners that come with your NOVA Chuck. Designed by the innovators of the 4 Jaw Chuck for wood turning, Teknatool International - since 1955. Backed by a full replacement 2-year warranty, call our customer service center toll free on 1-866-748-3025.Some accessories such as larger jaws are only suitable for use on the larger NOVA Chucks, please check manual prior to use.