This High Speed Steel Bottom Tap features 8-40 threading for precise thread cutting in through holes and blind holes where threads must go to the bottom.High Speed Steel Bottom Tap 8-40 ThreadHigh speed steel construction for durability and heat resistance8-40 thread specification for standard machine screw applicationsBottom tap design for complete thread cutting to hole bottomProfessional-grade machining toolEssential for machine shops automotive repair and precision manufacturing applications requiring reliable threaded connections in metal components.