What type of mechanism should hooks used on digger derrick synthetic load lines have?

The correct choice is throat latching for hooks used on digger derrick synthetic load lines. Throat latching hooks are designed with a safe and secure mechanism that prevents accidental disconnection of the load. Their construction typically includes a latching mechanism that secures the load by closing the throat of the hook and holds it in place during operation. This is especially critical in scenarios where the digger derrick may encounter dynamic loads or vibrations, as any unintended release could lead to dangerous situations.

In comparison, while pull latch and screw lock mechanisms provide secure methods of holding loads, they might not be as effective as throat latching in ensuring that the hook does not open unintentionally under load. Magnetic latches, on the other hand, are not suitable for this application due to the nature of loading and the need for robust mechanical engagement that throat latching provides. Therefore, throat latching is specifically advantageous for maintaining safety and operational integrity in digger derrick operations.