Removing fastener by drilling

If the bolt or nut is not possible to turn out the above methods, it will only drilling, which is held as follows:

- A large drill, drill bolt head. If necessary before this can be drilled in the center of the bolt head drill a small hole preparatory;

- The remaining part of the screw or knock out or remove the pliers;

- If it fails, carefully drill through the threaded portion of the drill, a smaller face value corresponding to the thread and remove the remaining metal from mating.