The SGM solution is a substantial progress compared to the "C" hooks.
The handling operation of wire coils can be carried out by a single operator from the crane cabin or by remote control. This is not possible when using C-hooks as either an additional operator is needed in order to direct the crane operator on centring the wire coil or the crane operator himself will have to verify the centring operation, all leading to longer handling times in unsafe conditions. The use of an electromagnet results in an important reduction of damages to the wire coils with respect to the use of C-hooks.