90 Degree Adjustable Countersink .118 (3mm) to .315 (8mm) Drill Diameter .413 (10.5mm) to .610 (15.5mm) Countersink Diameter ID 4176-FV30900
More holes and countersinks — Haze Guitars
Countersinking: Choose the Right Woodworking Countersink Drill Bits
Chiloskit 3 Flute 90 Degree HSS Chamfering Tool Bit Countersink Drill Bit Set for Metal Wood Plastic Woodworking Metal Working Tool Bit Set, Pack of 6pcs - - Amazon.com
Countersink Drill Bits | Tannerbolt.com
The structure and application of countersinks | RUKO