combo pack 1/4-28 national fine tap & number drill bit #3. fractional tap. precision cut threads, accurately formed for consistent, exact threading. heat treated and tempered for file hard threads, and longer, useful life. designed for hand cutting applications.

• Heat treated and tempered for file hard threads and longer useful life
• Designed for hand cutting applications
• The plug style tap is the most commonly used style of tap with 3 to 5 threads chamfered