There are two ways of galvanization: Hot dipped(hot galvanized) and cold(electric) galvanized

Specification
Opening Wire gauge (BWG)
In inch In metric unit (mm)
1/4"X1/4" 6.4mmX6.4mm 22,23,24
3/8"X3/8" 10.6mmX10.6mm 19,20,21,22
1/2"X1/2" 12.7mmX12.7mm 16,17,18,19,20,21,22,23
5/8"X5/8" 16mmX16mm 18,19,20,21
3/4"X3/4" 19.1mmX19.1mm 16,17,18,19,20,21
1"X1/2" 25.4mmX12.7mm 16,17,18,19,20,21
1-1/2"X1-1/2" 38mmX38mm 14,15, 16,17,18,19
1"X2" 25.4mmX50.8mm 14,15, 16
2"X2" 50.8mmX50.8mm 12,13, 14,15, 16
Technical note: 1.      Standard roll length: 30m; width: 0.5m-1.8m 2.      Special sizes available as your request 3.      Packing: in water proof paper in rolls. Custom packing available as your request