Drill America DWTT1/2-13 1/2"-13 Carbon Steel Taper Tap (Pack of 1), DWT Series, Uncoated (Bright)

What tolerance are the different sizes h2? h3? h5? Are these even decent taps that don't specify a tolerance?

is this a set of 3 or 4 or just 1?

How do I get a 1/4x20 tap with a shank diameter smaller than thread dia. The one I received has a larger shank dia.

are the taps stamped or laser-etched? thanks in advance!