This is a manufacturer sourced replacement part used on a Craftsman routers. Carbon brushes are a some of the most commonly replaced power tool components. Because brushes are in constant physical contact with an armature, over time they will wear our requiring replacement. Most tools use two (2) carbon brushes. Please note, it is advised...Read more to replace both brushes at the same time. Includes one (1) carbon brush with lead wire and a spring attached. You would need a screwdriver to complete this job. • First remove the brush cap • Remove the old brush • Install the new brush • Reattach the brush cap and test your tool