Straight (tooth) files are made from alloy steel & have teeth which are undercut resulting in faster cutting with less effort. They may be used on all materials from aluminium to hardest steel without clogging.
the undercut & generous radius at the root of the teeth enables the file to clear itself whilst in use.
the blade type files are without a tang & have a hole at each end for attachment to a holder.
size. 14in. hand type
9 teeth per inch.