The Makita 517911-7 Demolition Hammer Armature Assembly provides the rotating electrical component needed for compatible demolition hammer motors. The armature works with the motor’s electrical system to convert electrical energy into rotational movement for tool operation. This replacement assembly is designed to replace a worn or damaged armature during power tool maintenance or rep... https://www.wholetoolbox.com/makita-517911-7-demolition-hammer-armature-assembly/517911-7.html