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Reference.org
Baseball bat
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<p>A baseball bat is a smooth wooden or metal <a href="/facts/Club_(weapon)/DRU9yL8M">club</a> used in the sport of <a href="/facts/Baseball/42bEQy1Y">baseball</a> to hit the <a href="/facts/Baseball_(ball)/U2033ze4">ball</a> after it is thrown by the <a href="/facts/Pitcher/08gAFpa3">pitcher</a>. By regulation it may be no more than 2.61 inches (6.6 cm) in diameter at the thickest part and no more than 42 inches (1.067 m) in length. Although historically bats approaching 3 pounds (1.4 kg) or 48 oz were swung, modern bats of 33 ounces (0.94 kg) are common, topping out at 34 to 36 ounces (0.96 to 1.02 kg). </p>