WORKPRO 10-Piece Pro Spade Drill Bit Set- Black Coating, Premium Carbon Steel, Paddle Flat Bits for Woodworking, Assorted Bits 1/4" to 1-1/2" with Storage Case - Amazon.com
Milwaukee 35mm Timber Spade Bit 48270135 | tools.com
Milwaukee Accessory 48-27-1001 1" Flat Boring Spade Bit - Amazon.com
13 Piece Flat Boring Spade Bit Set | Milwaukee Tool