This replacement carbon brush set is a genuine manufacturer sourced item. It is specially produced for Skil power tools. Motor brushes allow electricity to flow to the motor's spinning armature. Over time brushes will wear out and will require replacement. It is advised to replace both brushes at the same type. Please note, this set inclu...Read moredes (2) metal brush holders and (2) carbon brushes. You would need a screwdriver to replace these carbon brushes. • Make sure the tool is unplugged • First remove the housing/cover • Remove the old brush • Install the new brush • Reassemble and test your tool