The 2 draw bend is a particularly good note in blues because, if you’re playing cross harp, the full bend it is what’s know as a flat 7th or dominant 7th, which is used all the time.
There are 2 bent notes on 2 draw, the full bend is a tone down (2 semi-tones) and the other bend a semi-tone down.
So 2 draw on a C harp you’d get the clean note G, the bent note Gb and the fully bent F.