The pin jaw already has a small internal diameter for small spigots – but the dome jaws will grip right down to virtually zero, enabling even the tiniest spigots to be held in the jaw. The smooth dome enables the user to get the hand close to the workpiece for additional support on these fragile spindles, without the fear of protruding edges and jaws that could cause a hazard. It also enables a turner to get in behind a workpiece with a tool, for cleaning                                                                                      up where necessary.