It varies from player to player. Each player chooses the size and weight of his bat. Some players prefer a heavier bat with a thicker barrel. Some players prefer a thinner, lighter bat. And the weight can be distributed differently throughout the bat, so that the handle is thicker or thinner, or the barrel is thicker or thinner. Sometimes players will change bat sizes or shapes depending on how they're feeling at that particular time. Most players use a bat that weighs between 30 and 34 ounces. The bats are usually between 32 and 36 inches long. But again, there is a lot of variation in bat size, weight, and how the weight is distributed throughout the bat (size of the barrel, size of the handle, etc.). For example, Alfonso Soriano is reputed to use a bat that weighs 38 ounces. And Babe Ruth supposedly swung a bat that was 34 inches and weighed 42 ounces.
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The diameter of a major league bat can be up to 2 3/4 inches at its largest point.