MLB Rules (1.10) states that a bat may be no more than 2 3/4 inches at its thickest part. Barrels in MLB are between 2 1/2 and 2 3/4 inches.
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2 5/8 barrel size. Companies like Akadema, Louisville slugger and rawlings make these size aluminum bats.
3 in i think
In a young division such as HS or MS baseball it might be from 29in. - 31in. depending on your size
MLB sizes go from 32in. - 34in.