Kodiak Cutting Tools KCT202717 USA Made 1/4-20 Hand Threading Tap Set, Includes Taper, Plug and Bottom Taps, Ground Threads, High Speed Steel, H3 Limit, 4 Flute, 1/4" Diameter x 20 TPI (Pack of 3) Made In the USA .255 Shank Diameter 1 Thread Length 2-1/2 Overall Length 4 Flutes