The “Spool” is designed to keep the load centered on the pin, thus keeping the sling positioned correctly in the shackle bow.
Caldwell Dixon Coil Hook with Pivoting Wedge Model 80H
It's all about the pivoting wedge on this unit. By maneuvering that wedge in between two stacked coils, an operator can separate them and begin a tilt, allowing the rest of the hook to slide in and do its job. Features: Easy horizontal to vertical upending of coils...