I purchased my 2'' shanks from the beverage factory. I took a quick measurement to double check, and indeed, the threaded part of the shank is 2''. Total length of the shanks is 3.5''-4''. If you only have to make it through 1 1/2" plywood, you should be fine with some 2" or 3" shanks.
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Bad men live that they may eat and drink, whereas good men eat and drink that they may live. -- Socrates
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