These durable carbon brushes are practical replacement parts designed for chop saws and other electric cutting tools. They match part numbers N039389, N558583, N408735 and 622437-00, and fit a full range of compatible cutting saw models including D28700, D28715 and GR871 series. Old and worn carbon brushes will easily cause intermittent operation, insufficient power and other motor failures. Replacing with our new carbon brushes can effectively eliminate these common faults and make your power tools work smoothly again. With standard dimension (Length × Width × Height), these carbon brushes support direct plug-and-play installation without any adjustment. The built-in spring structure keeps constant pressure during operation, ensuring stable electric conduction and reducing abnormal sparks during work. Each package contains 4 pieces of carbon brushes. Enough quantity is suitable for daily household tool maintenance and regular replacement for industrial workshops, bringing cost-effective tool repair solutions.