Step Drill 5/16" Pilot 7/32" (.218)

5/16" Step Drill with 7/32" (.218) Pilot to fit Hidden Bolt Rivets 5/16". 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.