Steel brush made of short (approx. 1 cm) kinked metal wires that protrude through a thick (approx. 0.4 cm) piece of fabric. The latter is glued to a thin board (length approx. 10-15.5 cm; width approx. 2.5-5.5 cm) with a handle or a wooden block.
A file brush is used to remove wood or metal filings from the file. Brushing is done in the direction of the file cut. [MOT