Agree about the combined different pitches as opposed to "variable" pitch.
That's certainly not a 2x4...more like a 1 x 4 (3/4 x 3 1/2) or thinner, could be a slat from a pallet.
Don't know what other countries use for "standard" finished dimensions of wood products.....
U.S. system may seem very strange to others.......along with most everything else we've standardized.
My guess is that the wood is used to eliminate or reduce chatter. Can't see that large a diameter for given length material flexing enough to cause problems; although spork2367 has a somewhat different scenario and, as he said, would serve to avoid flexing.
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