Angle hand file, coarse grit. Excellent anywhere there is a 90° angle needed. Approximately 75°, which gives the builder the accuracy needed to shape a 90° angle. Either an 1/8th radius or a sharp corner can be produced simply by rotating the tool. Model builders find this particularly useful for fabricating servo trays, it is also good for cleaning corners and edges on laser cut wood. Very popular and a good starting point if this is your first Perma Grit hand tool purchase. Coarse grit is similar to 60 grit sandpaper in roughness.