This 280mm X 51mm sanding block from Perma-Grit uses tungsten carbide sanding paper on a lightweight, hollow metal frame. It has coarse grit one side and fine grit on the opposite side and is made with 45 degree angle to sand into tight corners.
These extremely versatile tungsten carbide tools from Perma-Grit are very popular for detailed work. They can cut in any direction and do not clog easily. The files cut quickly leaving an excellent finish.