Wolfcraft 2540 Countersink 1 and Rasps 4 Set | eBay
JNB Pro Wood Countersink Drill Bit Set - 5 Pc Adjustable Countersink Bit #6(9/64") - All Same Size - 2 Extra 9/64 Tapered Drill Bit, 1 Adjust. Collar, 1 Wrench - 1/4" Quick Change Shank - Countersink - Amazon.com