High quality material: CB440 carbon brushes are made of sturdy and durable copper with low stability and activity, not easy to corrode, and have a long service life. CB440 carbon brushes are one of the most widely used. Practical accessories: New Makita motor brushes can restore electric braking of electric motors (CB-440, CB-448, CB-436 , 195021-6, 194427-5 and 194159-4) to extend the life of the machine. Strong compatibility: carbon brushes are ideal replacement parts for power tools and are perfectly compatible with Makita BDF440, Makita BFR440, Makita BFR550, Makita BFR750, Makita BDA340, Makita BDA351 and other models. Included in delivery: 4 pieces of carbon for Makita (13x10x3mm) are supplied for the replacement and daily maintenance. Makita carbon pin replacement can fix intermittent motors, saving you time and money. Note: Please check the part number to make sure it fits before purchasing . When replacing the carbon brushes, be sure to inspect the armature for any signs of burning, cracking, or other damage that could indicate a major motor problem.