In the beginning years of the game of baseball, players could use and hand craft any design of wood baseball bat they wanted to get a competitive edge. It was common for players of the time to use 2?x4? flat surfaces for their bat of choice. I could not imagine that being very successful but it still is an interesting fact. It was not until 1859 that the first bat regulations were put in place. The wood bat could not be bigger than 2.5? in diameter(width), wood bats could be any length and shape that the player desired. Bat regulations slowly changed throughout the years until they got to where they are today. Now no professional bat can exceed 2.75? in diameter and no longer than 42? in length. The bat must be one piece of solid wood.