Premium Material: Made of good quality material, long-term service life, high strength and durability, ideal replacement for your old or worn part. Function: Worn brushes are often the cause of a poorly running motor. Replacing the brushes can fix an intermittent motor. Easy to Install: Designed to have a compact size and light weight as well, the installation can be quickly completed. Applicable to Rs550, the carbon brush with holder set ensures perfect matching and stable work. Please make sure it is suitable for your motor before purchase. Wide Application: Can be widely applied to driver, electric drill, electric screwdriver and many other tools.