Step Drill 1/4″ Pilot .175

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.