Gabion Sacks are cylindrical units which are made of double twisted steel woven wire mesh panel 5x7, 6 x 8 or 8 x 10cm according to ASTM A975-97 and EN10223-3.Gabion Sacks are filled with stone at the site to form flexible and durable structures to be used in river training and emergency works. Sack gabions are supplied with reinforcing wires to be inserted during the manufacturing process to facilitate closing during  installation. The wire used in gabion sacks is heavily zinc coated soft temper steel. Standard sizes are shown in Table 1.Mild Steel Wire All the wires used in gabion sacks and lacing wire have the tensile strength of 2 38-48kg/mm (54,000-70,000psi) acc.to BS1052/80 and ASTM A641-97.(The figures above are of the wire prior to manufacturing mesh). The tolerances on diameter of zinc coated wire.The elongation at break is min.12% and test to be carried out on a sample of minimum 30cm (12 in.) long, before manufacturing the mesh. (In accordance with ASTM  A370-92) Galvanisation strictly conforms to ASTM A641-97 Class III Soft Temper Coating.Zinc adherence has to be such that when thewire is wrapped around a cylindrical mandrel having 4 times the diameter of the wire, the zinc shall notflake or crack to such an extent that any flake or crack can be removed by simply rubbing with bare fingers.