3-1/2 Inch Diameter Forstner Drill Bit | PrecisionBits.com
Drill Bit Decimal Equivalency Chart - Vermont American
Amazon.com: STICKER FRENZY Drill Bit Sizes Inches mm to inches Chart and Metric and Standard Socket Chart Need a Conversion for Drill Bits Common Drill Bit Sizes in inches (.030" Magnet, 9"