When purchasing Reiff & Nestor Company or any other brand from eGoods365.com store, you can be sure that (a) you are purchasing from US based company with the most responsive and friendly customer service; (b) an authentic, not a counterfeit and not a refurbished product.

Not magic, just perfect! When we first tried these taps
(recommended by customer Dan Baldwin), we thought they were
extra hard, coated or treated somehow . . . they're that much
better than any tap we've ever used before. But, the U.S.
company that's been making them since 1912 says the secret is
plain old care and quality control. The ground threads are held to
incredibly tight tolerances for roundness, thread spacing, etc.
Result is, all the teeth cut equally so the whole tapping process
goes faster, the taps last longer, breakage is cut way down and
the threads are the finest you'll ever see. Try them; you'll tap more
holes per tap than you thought possible!

Premium Three-Flute Taps - Divides the tapping stresses over a “triangular” area, making it easy to start and to keep straight when tapping by hand. Stronger than two-flute taps, so preferable for hard or tough steels.
Premium Two-Flute Taps - Spreads the tapping stress over two large flutes, with more chip space than three-flute taps – a real help when tapping soft steels. A popular machine tap, great when hand turned, too.