... 1/4" x 1/4" 6.4mm x 6.4mm 22,23,24 3/8" x 3/8" 10.6mm x 10.6mm 19,20 ... ,21,22 1/2" x 1/2" 12.7mm x 12.7mm 16 ... 16,17,18,19,20,21 1" x 1/2" 25.4mm x 12.7mm 16,17,18,19,20,21 ... 18,19 1" x 2" 25.4mm x 50.8mm 14,15,16 2" x 2" 50.8mm x 50.8mm 12,13 ... MM Wire Diameter in BWG 1/2" x 1/2" 12.7mm x 12.7mm 16,17,18,19,20,21 ... 3/4" x 3/4" 19mm x 19mm 16,17,18,19,20,21 1 ...