Step Drill 1/4" Pilot .175

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1/4" Step Drill with .175 Pilot to fit Hidden Bolt Rivets 1/4". The step drill is a standard twist drill which has been ground to a smaller diameter on the end. It enables the user too drill a rivet hole through the handle slab with a counterbored hole for the rivet head in a single operation. Select a drill size that is the same diameter as the rivet head and a pilot that is the same diameter as the center section of the rivet. Show more