Genuine Bosch replacement part. New, Bulk Packed. Genuine Bosch Replacement Part. Consult owners manual for proper part number identification and proper installation. Please refer to list for compatibility. Bosch B1450 Plunge Router Replacement Carbon Brush Set typically includes two replacement carbon brushes. Carbon brushes are electrical conductors that conduct electricity from the motor to the rotating parts of your router. Over time, these brushes wear down and need to be replaced to maintain the performance of your router.