The jaw set included with the Titan III will only fit the Titan, but my other Nova jaw sets that I acquired for the Nova G3 will fit the Titan using 2 of the 3 screws. This is one of the features that draws me to buying a Nova chuck, the capability to use my other jaws with it. However, I will still keep 2 G3 chucks after selling my old lathe so this might not really be as important as I thought.