... construction in the form of reinforcement brick mesh, welded bar gratings or wire mesh sandwich construction. A wire mesh sandwich construction which comprises an array ... Wire MeshOpeningWire DiameterIn inchIn 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 ... 12.7mm16,17,18,19,20,21,22,235/8" x 5/8"16mm x 16mm18,19,20,21,3/4" x ...