square welded wire mesh 1.steeel,iron welded wire mesh 2.1/2"X1/2",1"X1" etc mesh size 3.ISO certification ... metric unit(mm)1/4" x 1/4"6.4mm x 6.4mm22,23,243/8" x 3/8"10.6mm x 10.6mm19,20,21,221 ... /2" x 1/2"12.7mm x 12.7mm16 ... ,19,20,21,22,235/8" x 5/8"16mm x 16mm18,19,20,21,3/4" x 3/4"19.1mm x 19.1mm16,17,18,19 ...