Tap and Die Set, Number of Pieces 21, Die Shape Round, Tap Type Straight Flute, Die Material Carbon Steel, Thread Sizes Included 1/2 In.-13, 1/4 In.-20, 3/4 In.-10, 3/8 In.-16, 5/16 In.-18, 5/8 In.-11, 7/16 In.-14, 9/16 In.-12, Die Thread Sizes Included 1/2 In.-13, 1/4 In.-20, 3/4 In.-10, 3/8 In.-16, 5/16 In.-18, 5/8 In.-11, 7/16 In.-14, 9/16 In.-12, Number of Dies in Set 8, Thread Standard UNC WARNING: This product can expose you to chemicals including Chromium (hexavalent compounds), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. -