... sizes: Pillar: 3"x3", 3"x4", 3"x5", 3"x6"; 3.5"x4", 3.5"x5", 3.5"x6"; 4"x4", 4 ... "x5", 4"x6" Square: 3"x3"x3", 3"x3 ... "x4", 3"x3"x5", 3"x3"x6"; 3.5"x3.5"x3.5", 3 ... .5"x3.5"x4",3.5"x3.5"x5",3.5'x3.5"x6"; 4"x4"x4",4"x4 ... "x5", 4"x4"x6" What Is the Difference Between A Single ...