Triumph® Twist Drill Thundertap® spiral point tap, 1/4 in - 20 NC, T63HD series, H3 thread limit, 3-5 long plug chamfer, 2 flutes, bronze oxide, HSS, 6 pk. Triumph® Twist Drill Thundertap® 71200 T63HD Spiral Point Tap, 1/4-20 Thread, H3 Thread Limit, Plug Chamfer, 2 Flutes, Bronze Oxide, HSS