With a .150" seat, this needle and seat assembly is about as big as you can get. This needle design is very responsive to changes in flow rates and has excellent sealing capabilities. "Viton" needle and seat is resistant to dirt and provides superior seal when closed. Size .150" for alcohol carbs. Gasket not included. .150" seat. Adjustable. Stainless Steel. Compatable with racing fuels that contain benzine, acetone and alcohol. Gasket not included.