Feature●This tap can effectively extend the usage time of screws by cutting new screws or repairing damaged screws●Straight flute tap: straight flute design, downward shavings removal Right hand threading, fast and precise tapping Suitable for through hole processing For tapping aluminum, die steel, stainless steel, bronze, and hard plastic●Twist Drill Bit: Spiral tip space design allows for quick and clean removal of shavings Sharp edge for smooth cutting and no glitch. It is hard to stick to tools. For drilling stainless steel●Tap application: Used for drilling machines, tapping machines, CNC, milling machines. When used with tapping oil, you get a higher quality thread and more durable tap. Machine taps are recommended for use with tap collets with overload protection●Drill Bit Tip: Proper lubricant promotes cutting or cooling, makes cutting easier and improves smoothness and dimensional accuracy. Please select the appropriate feed and cutting speed to extend the life of the toolDescription 1/2"-20 UNF Machine Tap, HSS 1/2 x 20 UNF Screw Tap Left Hand