NOVA IDNS 1" X 8TPI INSERT FOR NOVA CHUCKS (Most Common) WITH 2 EXTRA JAW SCREWS 1" x 8tpi Nova Insert - Most Common Fits Supernova 2, Supernova, G3 chucks to adapt to 1" x 8tpi Includes 2 Extra jaw Screws (spares for when you lose one in the shavings).