A high quality double-cut smooth file made from alloyed high-carbon tool steel and fitted with a Holtzapffel pattern Walnut handle.
For best results, hold the file at both ends and at a slight angle to the work. Advance the file forward and across, with even pressure to bring the maximum number of teeth into contact with the work. Avoid rocking and lift off on the return stroke to avoid dulling the cutting ridges.
To clean your files gently brush out any accumulated debris with a soft wire brush or file card, always going along the ridges rather than across them. To minimise the chances of the file clogging when working with soft metals, apply chalk liberally to the surfaces before you begin.