Liberty Supply Professional Maple Tree Tapping Drill Bit for 5/16" Tap Hole 5/16" Tapping Bit. Works with all 5/16 taps. Specially engineered 90 degree point. USA MADE! You dont want that black coating in you or your trees. Very effective at removing wood chips. Don't blow into the tap hole! Clean cut tap holes stay open longer and produce much more sap! Saves battery life on your drill since it cuts so effeciently. Hex Chuck.