Having a slight problem...

[Tomato Cat]

That's correct.

But you'll have to add a use item callback (see my above post) if you want the player to use the knives on something.

...Unless you just want the player to pick up the knives? Which wouldn't make sense because they're both have "static" in their names.

Uh, I'm a bit confused. o.O

The "player interact" callback is when the player interacts with the entity, like picking it up. As opposed to "using" the item, which is an item-entity interaction.