Mini Cole Jaw Set is for the SuperNova 2, G-3 and the Midi Chuck. Design for use on mini-lathes. Minimal 8" dia., opens to 10". Space the 8 rubber stoppers in any of 8 diameter positions on the face of the collet plates to finish the bottom of bowl. For larger bowls the stoppers may grip from the inside as the chuck expands outward. Any of your own custom made wooden plates may be applied. Manufacturer recommends not to exceed 800 RPM with the Mini Cole Jaw Set.