Some models have hooks that have file surface on the back edge of the hook. Though don't think that model, the Deluxe Tinker, does.

Think the original use was to provide a T handle to carry string bound parcels. Have heard of them being used to carry plastic bags more comfortably.

If don't think the pliers look up to much, the Super Tinker provides the same set of tools without the pliers.

And the Tinker removes the scissors, pliers and hook.