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I can't say I really understand the design of the Becker line. The Necker looks about perfect. The BK7 and BK9 are both 1/8th of an inch...

Uh, the BK7 and BK9 are .188" thick. If they were 1/8" thick, that would be .125". 3/16" is just about .188" thick (3/16 actually being .1875). Anyway, just thought I'd clarify.

As far as the BK2 being a full 1/4" thick, I think that the bigger knives may be slightly thinner so they can chop, but still be quick in the hand. In other words, the slightly thinner blades of the BK7 and BK9 may be to maintain the blade heavy balance while avoiding too much blade forward weight. Does that make sense?