BRIDGE THREADED INSERT REMOVAL TOOL. For those who know you must have a ground wire connected to the bridge of a electric guitar so it won't feed back or cause humming in the amplifier. some guitar manufactures don't install this wire.
It is then necessary to drill a hole in the pickup pocket to the bridge insert hole and remove the insert, put a bare wire in the hole and attach it to the grounding system for the guitar. replace the insert and that should take care of the humming in the amplifier from an UN-grounded bridge guitar.
This tool is screwed in to the insert and back hammered to pull it out then simply hammer back in after wire insertion and your done.