Contact Point. Hand. File Great For Metalsmiths, Metal Working & Filing. This is a new contact point hand file. It is mainly used for cleaning engine distributor points, spark plugs and electrical contacts. Has little or no clogging, a light knock is enough to loosen any clogging. Highly resistant to corrosion. Heat treated to exacting standards to provide top performance and long life. It measures approximately 5 1/4" x 5/16" (133.35 x 8 mm).