Gray professional parts for contemporary filing technology. 180/180 grain, the straight-line design and a new generation of powder coating technology optimize the new, contemporary filing technique of the Master Gel. The narrow side makes the side lines in shape, the width is suitable for the optimal shaping of the surface. Both filing sides have the same grain size, which ensures a uniform result. The new Master Slim File guarantees a gentle file, protects the surface and ensures a low level of dust.