A baseball bat is a smooth wooden or metal rod used in the game of baseball to hit the ball after the ball is thrown by the pitcher. It is not more than 2⅔ inches (70 mm) in diameter at the thickest part and not more than 42 inches (1067 mm) in length. It typically weighs no more than 36 ounces (1 kg). The batter uses the bat two-handed to try to hit a pitched ball fair so that he may become a runner, advance bases, and ultimately score a run or help preceding runners to score. Lumber is a sometimes-used slang term for a bat, especially when wielded by a particularly good batter. (wikipedia)