... . Specification(hole size) Gauge BWG (wire diameter) 1"X1" 14, 15, 16, 17, 18 2"X2" ' 10, 11, 12, 13, 14 ... , 15, 16, 17 3"X3" 10, 11, 12, 13, 14 4"X4" ... , 14 1"X2" ' 14, 15, 16, 17, 18 2"X1" 14, 15, 16, 17, 18 3/4"X3/4" 16, 17, 18, 19, 20, 21 ... "X1/2" 18, 19, 20, 21, 22 1/2"X1' 16, 17, 18, 19, 1/4"X1/4" 23 3/8 ...