The Ibanez S6570SK has a metal bar on the headstock, right behind the nut.
I have seen guitars that have metal hooks behind the nut (the Fender Telecaster comes to mind), but such guitars usually have an open nut, and a flat headstock, and the metal hooks are used to force a downward angle on the strings to avoid buzzing.
This Ibanez, on the other hand, has a locking nut. Surely this by itself fixes the buzzing hazard. So, what is the point of having that bar behind the nut?