These OEM sourced replacement brushes are designed for use with Milwaukee hammer. Over time brushes will wear down and would need to be replaced. It is advised to replace both brushes at the same type. This assembly includes two (2) carbon brushes with lead wires attached. Please note brush holders are sold separately. You would need a ...Read morescrewdriver to complete this repair. • Make sure the unit is unplugged • Remove the screws from the cover/housing • Remove housing to gain access to the armature and brushes • Remove old brushes and replace them with new ones • Re-assemble and test the tool