Fisch FSA-196037 16pce Wave Cutter Forstner Bit Set In Custom Wooden Box, Includes bits from 1/4-Inch up to 2-1/8-Inch - Power Drill Accessories - Amazon.com
Festool 491077 Euro-HInge Boring Bit HW 35mm - - Amazon.com
Irwin 42906 3/8-Inch by 3/8-Inch Shank Forstner Bit - - Amazon.com