NOVA ILNS 1-1/4" X 8TPI INSERT FOR NOVA CHUCKS W LOCKING SET SCREW, AND WITH 2 EXTRA JAW SCREWS 1-1/4" x 8tpi Nova Insert with locking set screw (for reverse turning) Fits Supernova 2, Supernova, G3 insert type chucks to adapt to 1-1/4" x 8tpi Includes 2 Extra jaw Screws (spares for when you lose one in the shavings).