This ceramic fiber brush is specially developed for removing micro burrs on the bottom of blind holes in hydraulic valve blocks. Flexible yet abrasive ceramic filaments can reach deep hidden blind hole bottoms that ordinary brushes cannot access. It thoroughly cleans residual machining burrs without scratching the inner wall and bottom precision sealing surface of valve blocks. Suitable for automated CNC deburring procedures, it ensures uniform finishing effect in bulk processing, avoids hidden risks of burr falling off blocking oil circuits, and greatly improves the stability and reliability of hydraulic valve assemblies.