How to ensure the safety of beam loading？

To ensure double guarantee for the beam loading, we recommend to use two piece of loading chain  for each side .One is for loading the other is for safety ( This safety chains  should be one or two cm longer than the loading chains.)  But we need an Extra Charge,for the safety loading chain is 5.7USD/PC.Increase the safety lanyards is OK, incur additional costs, the average price of 5.7USD / PC.