1.carbon brush for power tools 2.long service life 3.small noise 4.ISO9001 ... motor brushes holders,power tools brushes,auto carbon brushes, industrial traction motor brushes, train engine brushes, motor slip rings,commutator,carbon-graphite ... upon special requirements.We use complete set of automatical equipments for grinding blending, rolling, second grinding, forming, roasting and graphitizing, ...