Need more info. Size screw, type, what's it in,......
Maybe a picture
Maybe a picture
I have used that on certain screw heads when it was the only option left, since I sometimes ruin the head or snap it off.Another option is to use a Vise Grip on the head. I have even used one Vise Grip clamped to the head and another Vise Grip clamped to the first Vise Grip to turn it.