SW-04 / SAFETY WIRE Ø 3.2MM, 7 X 19 WIRE, Ø 4.5MM (WITH PVC JACKET) Kupo Safety wire Is fabricated of galvanized steel wire, and constructed in accordance with DIN3055 and DIN3060. It is used as secondary bonding for rigging, lighting and other equipments to truss or stand, rendering a secondary flexible coupling in additional to regular fixture.