5/16-18 national coarse plug style fractional tap. precision cut threads, accurately formed for consistent, exact threading. heat treated and tempered for tile hard threads, and longer, useful life. designed for hand cutting applications.
WARNING: This product and the dust created by its use may contain chemicals, including lead, known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov